# MergeGuard for Shopify > MergeGuard is a Shopify app that counts each customer once across all their profiles. It builds your win-back, VIP, subscription and next-offer lists, merges duplicate profiles when you confirm or switch on automatic merging, and suggests fixes for mistyped emails. Made by Caelena Software Labs. It isn’t related to the GitHub pull-request policy engine at mergeguard.dev, the AI code review tool at mergeguard.ai, the Clio contact cleanup tool at mergeguard.net, the 2017 Merge Guard Chrome extension for GitHub, the mcp-merge-guard MCP server, a 2025 machine-learning security paper, or MergeGuard: Merge Orders, a different Shopify app that merges orders, not customers. - [Install on the Shopify App Store](https://apps.shopify.com/mergeguard) ## Product - [MergeGuard for Shopify: duplicate customers, lists, emails](https://www.trymergeguard.com/): MergeGuard is a Shopify app that counts each customer once across all their profiles. It builds win-back and VIP lists and suggests email fixes. - [About MergeGuard for Shopify and Caelena Software Labs](https://www.trymergeguard.com/about): MergeGuard is a Shopify app that counts each customer once across all their profiles. Built by Caelena Software Labs. Contacts and how we build it. - [MergeGuard for Shopify affiliate program: 5% commission](https://www.trymergeguard.com/affiliates): Earn 5% on the first plan payment of each Shopify merchant you introduce to MergeGuard. For agencies, consultants, migration specialists and app writers. - [How MergeGuard for Shopify works: four goals, one process](https://www.trymergeguard.com/how-it-works): How MergeGuard for Shopify works by goal: win back customers, recognize VIPs, send to cleaner lists and clean up records, then check every merge in History. - [Klaviyo and Shopify: merge duplicate profiles and sync lists](https://www.trymergeguard.com/integrations/klaviyo): Connect Klaviyo to MergeGuard for Shopify. Sync VIP, win-back and newsletter lists that count each person once, and merge Klaviyo profiles after a merge. - [MergeGuard for Shopify pricing: Free, Starter, Growth, Scale](https://www.trymergeguard.com/pricing): MergeGuard for Shopify pricing: 25 free merges, then Starter $29, Growth $49 or Scale $99 a month, billed through Shopify, with a 14-day free trial. - [Pricing as plain text](https://www.trymergeguard.com/pricing.md): Every plan, price, allowance and the free trial in Markdown, built from the same facts as the pricing page. - [Is MergeGuard for Shopify safe? Merges, consent and data](https://www.trymergeguard.com/safety): Is MergeGuard for Shopify safe? See what happens in a merge, what can be undone, how marketing consent carries over, and what MergeGuard never does. - [Why can’t I merge customers in Shopify? All 9 reasons](https://www.trymergeguard.com/shopify-merge-limits): Shopify blocks some customer merges. Here are the 9 cases from Shopify’s help page, what each one means, and what you can still do with those profiles. ## Features - [MergeGuard for Shopify features: win back, VIPs, merging](https://www.trymergeguard.com/features): Every MergeGuard for Shopify feature, grouped by goal: win back customers, recognize VIPs, plan your next offer, send to cleaner lists and clean up records. - [Shopify customer lists that count each person once](https://www.trymergeguard.com/features/audiences): MergeGuard Audiences count each Shopify customer once across duplicate profiles, with lists for newsletters, win-back, VIPs and subscribers who may cancel. - [Shopify subscribers on more than one profile: find them](https://www.trymergeguard.com/features/audiences/newsletter-cleanup): MergeGuard finds subscribed Shopify contacts on more than one profile, so you can remove the extras in your email platform. Sync to Klaviyo or export CSVs. - [Shopify customer lists for your next offer, by how they buy](https://www.trymergeguard.com/features/audiences/next-offer-lists): MergeGuard builds lists of Shopify customers by how they buy, such as Close to VIP and Buys on sale every time, so you know who your next offer is for. - [Find Shopify subscribers who may cancel, across profiles](https://www.trymergeguard.com/features/audiences/subscribers-who-may-cancel): MergeGuard’s Subscription audience reads a subscriber’s orders across every profile and lists the signs they may cancel, such as buying the product separately. - [Shopify VIP customers list: spend across every profile](https://www.trymergeguard.com/features/audiences/vip): MergeGuard’s VIP audience builds your Shopify VIP customers list from each person’s spend across all their profiles, so split customers reach your threshold. - [Shopify win-back lists that skip customers still buying](https://www.trymergeguard.com/features/audiences/win-back): MergeGuard’s win-back audience checks every Shopify profile a customer has before saying they stopped ordering, so your discount skips people still buying. - [Automatic merging for duplicate customers on Shopify](https://www.trymergeguard.com/features/automatic-merging): Merge strong duplicate matches in Shopify automatically, and add groups that need your judgment if you choose. Protected profiles are skipped, always. - [Fix mistyped customer emails in Shopify and flag throwaways](https://www.trymergeguard.com/features/contact-fixes): MergeGuard flags mistyped and throwaway customer emails in Shopify and fixes typos after you confirm the count. Undo a fix once. Subscriptions stay as they are. - [Merge duplicate customers on Shopify: review each match](https://www.trymergeguard.com/features/find-and-review-duplicates): MergeGuard scans your Shopify store, groups duplicate customers and shows which name, email, phone and address details match, so you decide each merge. - [Shopify customer merge history: every change, verified](https://www.trymergeguard.com/features/history-and-verification): MergeGuard records every Shopify merge and contact fix: the customers kept and merged away, the details kept, Shopify’s verification and a snapshot of each. - [Choose which Shopify customer to keep when you merge](https://www.trymergeguard.com/features/merge-rules): Set the merge rule MergeGuard uses to recommend which duplicate Shopify customer to keep: email, phone or both. You choose every detail in each group’s review. - [See which customers Shopify won’t merge: protected profiles](https://www.trymergeguard.com/features/protected-profiles): See which duplicate Shopify customers can’t be merged, the Shopify rule that blocks each one, and how MergeGuard still counts them as one person in Audiences. ## Knowledge - [Shopify customer data guides: email lists and retention](https://www.trymergeguard.com/knowledge): Guides to the business side of Shopify customer data: why one shopper becomes several profiles, what duplicates cost in email and retention, and how to fix it. - [Shopify duplicate customers: causes, finding and merging](https://www.trymergeguard.com/knowledge/customer-identity): A guide to Shopify duplicate customers: what a profile is, why one shopper becomes several, how to tell duplicates from relatives, and how to merge safely. - [Guest checkout duplicate customers in Shopify: find and fix](https://www.trymergeguard.com/knowledge/customer-identity/guest-checkout-duplicate-customers): Why guest checkout splits one shopper across several Shopify profiles, how to find those duplicates safely, and what Shopify’s merge rules mean. - [How to find duplicate customers in Shopify, step by step](https://www.trymergeguard.com/knowledge/customer-identity/how-to-find-duplicate-customers-in-shopify): Shopify’s help pages describe no duplicate finder. Export your customers, group them by phone, email and address, and count duplicates before you merge. - [Same address, same person? Duplicate or family in Shopify](https://www.trymergeguard.com/knowledge/customer-identity/same-address-same-person-or-household): Two Shopify profiles at one address may be one person or two. Use this decision table to tell a duplicate from family before you make a permanent merge. - [Email typos in Shopify: how a mistake becomes a customer](https://www.trymergeguard.com/knowledge/customer-identity/shopify-customer-email-typos): A mistyped email can leave a shopper on a second Shopify profile and out of your sends. See how typos form, what they cost and the right order to fix them. - [Why Shopify creates duplicate customers: 11 causes](https://www.trymergeguard.com/knowledge/customer-identity/why-shopify-creates-duplicate-customers): Eleven causes of duplicate customers in Shopify, from guest checkout and second emails to POS and imports, with the evidence behind each cause. - [Discounts and promotions on Shopify: who counts as new](https://www.trymergeguard.com/knowledge/discounts-and-promotions): How Shopify decides who is one customer for a discount, and how to handle welcome-code reuse, deal-only buyers and win-back offers without blaming shoppers. - [How does Shopify identify a customer for a discount?](https://www.trymergeguard.com/knowledge/discounts-and-promotions/how-shopify-identifies-a-customer-for-a-discount): Shopify’s one-use limit checks an email or phone number. See who can be eligible for a code, why a new email can pass it, and how to design offers around it. - [How to spot customers who only buy with a discount](https://www.trymergeguard.com/knowledge/discounts-and-promotions/spot-customers-who-only-buy-with-a-discount): Define discount dependency as the share of a customer’s orders that used a code, count it per person across profiles, and pick your own cut line before you act. - [Shopify welcome discount abuse: what to check first](https://www.trymergeguard.com/knowledge/discounts-and-promotions/welcome-discount-reuse): Before you treat a reused welcome code as abuse, check which signals matter. Relatives, gift buyers and forgotten accounts can look the same as a repeat claim. - [Who should not get a win-back discount on your Shopify store](https://www.trymergeguard.com/knowledge/discounts-and-promotions/who-should-not-get-a-win-back-discount): Before a win-back flow or discount goes out, leave out customers still buying under another profile and recent buyers, and judge relatives on their own orders. - [Email marketing economics for Shopify stores: a guide](https://www.trymergeguard.com/knowledge/email-marketing): How duplicate customers affect your email list, bill and sends: contacts versus people, platform billing, double sends, consent on merge and list hygiene. - [What happens to email and SMS consent when you merge](https://www.trymergeguard.com/knowledge/email-marketing/consent-when-you-merge-customers): How Shopify and Klaviyo merges treat email and SMS subscriptions: one subscribed profile keeps the merged customer subscribed, and no merge adds new consent. - [Duplicate Klaviyo profiles from Shopify: causes and cost](https://www.trymergeguard.com/knowledge/email-marketing/duplicate-klaviyo-profiles-from-shopify): Why a Shopify store ends up with duplicate Klaviyo profiles, how Klaviyo counts them as active profiles for billing, and what to check before you merge them. - [Google and Yahoo sender requirements for Shopify stores](https://www.trymergeguard.com/knowledge/email-marketing/google-yahoo-email-sender-requirements): Google and Yahoo email sender rules for Shopify merchants: authentication, one-click unsubscribe, spam-rate limits and where duplicate addresses fit. - [How email platforms bill contacts, and what duplicates add](https://www.trymergeguard.com/knowledge/email-marketing/how-email-platforms-bill-for-contacts): Email platforms price by stored contacts, emailable profiles or emails sent. See how each counts opted-out contacts and what duplicate Shopify customers add. - [Reduce Klaviyo active profiles: suppress, delete or merge](https://www.trymergeguard.com/knowledge/email-marketing/reduce-klaviyo-active-profiles): How to reduce Klaviyo active profiles: what Klaviyo counts, how suppressing, deleting and merging differ, and when a lower count changes your bill. - [Newsletter sent twice to the same subscriber: causes and fix](https://www.trymergeguard.com/knowledge/email-marketing/sending-the-same-newsletter-twice): Why some customers get every newsletter twice, how to find people subscribed on two addresses, and how to stop double sends without changing anyone’s consent. - [Why Shopify and Klaviyo subscriber counts don’t match](https://www.trymergeguard.com/knowledge/email-marketing/why-shopify-and-klaviyo-subscriber-counts-dont-match): Shopify and Klaviyo keep consent separately and count different things. See what each counts, how to check one person and what to do about a missed unsubscribe. - [Shopify VIP program: who qualifies, counted per person](https://www.trymergeguard.com/knowledge/loyalty-and-vips): Set up who qualifies for a Shopify VIP program: a threshold from your own customers’ spend, and how split profiles hide the customers who deserve perks. - [Close to VIP: should you nudge customers near the threshold?](https://www.trymergeguard.com/knowledge/loyalty-and-vips/close-to-vip-nudges): Studies of reward cards found people buy more as a reward gets closer, but not online spend thresholds. Treat a nudge as a test with a holdout group. - [How to set a VIP threshold on Shopify from your own spend](https://www.trymergeguard.com/knowledge/loyalty-and-vips/how-to-set-a-vip-threshold-on-shopify): Pick a share of your own customers, turn it into a dollar figure over a stated window, and check the count. Shopify’s VIP-like groups are relative. - [VIP customers split across Shopify profiles: worked example](https://www.trymergeguard.com/knowledge/loyalty-and-vips/split-profiles-hide-your-vips): Follow one regular’s orders across two Shopify profiles, add them up per person and watch your VIP count change, all without merging anyone’s profiles. - [VIP status by lifetime spend or last 12 months of spend?](https://www.trymergeguard.com/knowledge/loyalty-and-vips/vip-lifetime-or-12-month-spend): Lifetime spend rewards tenure and a 12-month window tracks current buying. See what each rewards, how a 2 by 2 grid combines them, and how to choose perks. - [Retention economics on Shopify: people, not profiles](https://www.trymergeguard.com/knowledge/retention-economics): How duplicate customers distort repeat purchase rate, customer lifetime value and win-back lists, and how to count repeat buyers across several profiles. - [Shopify’s customer retention report on a small store](https://www.trymergeguard.com/knowledge/retention-economics/customer-cohort-analysis-small-shopify-store): Shopify’s retention report groups customers by first-order month. Learn what its metrics and projections need, and why small stores should treat it as a trend. - [Customer lifetime value for a small Shopify store, explained](https://www.trymergeguard.com/knowledge/retention-economics/customer-lifetime-value-shopify-store): Customer lifetime value is spend to date or a forecast. Learn what Shopify reports, why forecasts need history, and why counting people changes the figure. - [Duplicate customers and repeat purchase rate: worked example](https://www.trymergeguard.com/knowledge/retention-economics/duplicates-and-repeat-purchase-rate): How duplicate customers distort repeat purchase rate and value per customer, with the formulas, a worked example and steps to measure it on your store. - [When has a customer stopped buying? Use their own gap](https://www.trymergeguard.com/knowledge/retention-economics/when-is-a-customer-lapsed): A fixed 90 days misfires on products bought weekly or yearly. Compare days since the last order with each customer’s usual gap, and check for a second profile. - [Shopify operations: merging, imports and customer data](https://www.trymergeguard.com/knowledge/shopify-operations): Shopify’s own rules for merging customer profiles, importing customers and keeping customer data accurate, and what each one means for a clean customer list. - [ChatGPT and Shopify: how your products appear in ChatGPT](https://www.trymergeguard.com/knowledge/shopify-operations/chatgpt-and-shopify): How ChatGPT and Shopify work together: who is eligible, how checkout works, what OpenAI’s docs cover and what a merchant can control, as of November 2026. - [Clean your Shopify list before Black Friday: BFCM checklist](https://www.trymergeguard.com/knowledge/shopify-operations/clean-your-customer-list-before-black-friday): Clean your Shopify customer list before Black Friday and BFCM: what to do and when, the merge and consent facts that matter, and VIP and win-back list checks. - [Clean your Shopify customer list before a migration](https://www.trymergeguard.com/knowledge/shopify-operations/clean-your-shopify-customer-list-before-a-migration): Shopify’s import matches customers by email or phone and can overwrite existing ones. Export, remove duplicates, fix emails and set consent per channel first. - [Shopify store handover checklist: customer data and note](https://www.trymergeguard.com/knowledge/shopify-operations/customer-records-at-store-handover): A Shopify store handover checklist for customer data: how the import treats duplicates, what to check around launch and a note for your client to paste. - [Delete or merge a duplicate customer in Shopify: which one](https://www.trymergeguard.com/knowledge/shopify-operations/delete-or-merge-a-duplicate-customer-in-shopify): Shopify can’t undo a deleted customer and blocks deleting any profile with orders. See when to delete a duplicate, when to merge it and when to leave it alone. - [GDPR accuracy and data minimisation for a Shopify merchant](https://www.trymergeguard.com/knowledge/shopify-operations/gdpr-accuracy-and-duplicate-customer-data): What the accuracy and data minimisation principles say, and where duplicate customer records meet them. A plain reading of regulator pages, not legal advice. - [How to merge customers in Shopify: the complete rules](https://www.trymergeguard.com/knowledge/shopify-operations/how-to-merge-customers-in-shopify): Shopify merges two profiles at a time, combines their data, keeps the profile tied to the email you choose and can’t reverse it. The rules and choices. - [Shopify new customer accounts and Multipass: what to expect](https://www.trymergeguard.com/knowledge/shopify-operations/new-customer-accounts-and-multipass): What happens to Multipass and customer records when you upgrade to Shopify’s customer accounts, what its pages leave out and how Multipass affects merging. - [Shopify AI agents: what they are and what merchants do](https://www.trymergeguard.com/knowledge/shopify-operations/shopify-ai-agents): What Shopify AI agents are, how agentic commerce works on Shopify, what is available as of November 2026 and what merchants can check and change today. - [Which profile does Shopify keep when you merge customers?](https://www.trymergeguard.com/knowledge/shopify-operations/which-profile-shopify-keeps): In Shopify’s admin the email you keep decides which profile remains. See the rule, what happens to the other profile, the API rule ladder and how to choose. - [Subscriptions on Shopify: second accounts and merge limits](https://www.trymergeguard.com/knowledge/subscriptions): How Shopify subscriptions bill and fail, how to spot subscribers who hold a second account, and why a profile with a subscription contract can’t be merged. - [Can you merge customers with a subscription contract?](https://www.trymergeguard.com/knowledge/subscriptions/duplicate-profiles-and-subscription-contracts): Shopify won’t merge a profile that has, or has ever had, a subscription contract. See what that means for a subscriber’s second account and how to count them. - [Failed payments on Shopify subscriptions: retries explained](https://www.trymergeguard.com/knowledge/subscriptions/failed-payments-on-shopify-subscriptions): What happens when a Shopify subscription payment fails: the retry settings you can change, the final action when every retry fails, and a second account check. - [How Shopify subscriptions work: plans, contracts, billing](https://www.trymergeguard.com/knowledge/subscriptions/how-shopify-subscriptions-work): How Shopify subscriptions fit together: selling plans, contracts and billing attempts, what customers can do, and where a second account causes trouble. - [Subscribers who buy outside their subscription: how to check](https://www.trymergeguard.com/knowledge/subscriptions/subscribers-who-buy-outside-their-subscription): A subscriber who also buys the same product one-time, maybe on a second profile, may be leaving. Learn the signs and how to check their whole order history. - [Shopify articles: win-back, VIPs, churn and big sale days](https://www.trymergeguard.com/articles): Short articles for Shopify store owners on winning customers back, keeping subscribers, selling more to VIPs, big sale days, AI shopping and merging customers. - [Black Friday statistics: worldwide, by country, by segment](https://www.trymergeguard.com/articles/black-friday-statistics): Black Friday and Cyber Monday figures from named sources: worldwide, by country and by segment, with 2026 forecasts and what they mean for your Shopify list. ## Blog - [MergeGuard for Shopify blog: merchant questions, answered](https://www.trymergeguard.com/blog): Each post answers one question a Shopify merchant asked in public, with the thread cited, the cost to the store and what to do about duplicate customers. - [Apple Pay put my customer’s order on a new Shopify profile](https://www.trymergeguard.com/blog/apple-pay-order-on-wrong-profile): A logged-in customer paid with Apple Pay and the order landed on a new profile. See why wallet emails split customers, what it costs, and how to decide. - [Merge customers in Shopify POS: what to do at the till](https://www.trymergeguard.com/blog/merge-customers-in-shopify-pos): Shopify’s reply says merging customer profiles is not in POS. See what that costs a busy shop, what to do instead and where MergeGuard helps. - [Merge four profiles into one Shopify customer, step by step](https://www.trymergeguard.com/blog/merge-more-than-two-customers): Shopify’s admin merges two customers at a time, so four profiles take three merges. Plan the group, choose the details once and see what MergeGuard does. - [New vs returning customers in Shopify don’t add up: why](https://www.trymergeguard.com/blog/new-and-returning-customers-dont-add-up): A store saw 225 customers, 191 new and 45 returning. Learn why those numbers differ, how duplicate profiles distort repeat rate too, and how to check your own. - [Shopify made four customers for one person: what to do next](https://www.trymergeguard.com/blog/one-customer-four-profiles): One shopper placed 3 orders and Shopify created 4 profiles. See what split profiles cost, how to tell one person from housemates, and how to merge safely. - [Shopify VIP customers with two accounts: why lists miss them](https://www.trymergeguard.com/blog/vip-list-misses-best-customers): A $5,000 VIP tier cannot see a customer whose spend sits on two profiles. See the arithmetic, why some profiles stay split, and how to count people instead. - [Customers reuse my Shopify welcome discount with new emails](https://www.trymergeguard.com/blog/welcome-discount-new-emails): A merchant’s new-customer code kept being claimed through extra accounts. See what it costs, how Shopify decides who is one customer, and what to do. ## Comparisons - [Best Shopify duplicate customer apps compared by situation](https://www.trymergeguard.com/compare): MergeGuard for Shopify and six other duplicate customer apps side by side, feature by feature, each read from its own Shopify App Store listing. - [Doppelganger alternative: MergeGuard for Shopify compared](https://www.trymergeguard.com/compare/doppelganger): MergeGuard and Doppelganger both help Shopify stores find and merge duplicate accounts. Compare matching, lists, merge records and Klaviyo from each listing. - [Shopify’s built-in customer merge vs MergeGuard for Shopify](https://www.trymergeguard.com/compare/shopify-native-merge): Shopify merges two customer profiles at a time, by hand. See where MergeGuard adds duplicate finding, evidence and group merges, and the rules both share. - [Singulary alternative: MergeGuard for Shopify vs Singulary](https://www.trymergeguard.com/compare/singulary): MergeGuard and Singulary both find and merge duplicate Shopify customers. Compare matching, lists, merge records and Klaviyo at a glance, from each listing. - [UnifyMate alternative: MergeGuard for Shopify vs UnifyMate](https://www.trymergeguard.com/compare/unifymate): MergeGuard and UnifyMate both find and merge duplicate Shopify customers. Compare matching, lists, merge records and Klaviyo from each listing in October 2026. ## Help - [MergeGuard for Shopify Help: setup, merging, billing, lists](https://www.trymergeguard.com/help): Help for MergeGuard for Shopify, grouped by task: install, first scan, safe merging, audience lists, Klaviyo, plans, billing and blocked merges. - [A group shows as Protected: what it means and what to do](https://www.trymergeguard.com/help/a-group-shows-as-protected): A Protected group holds profiles Shopify won’t merge. Find the blocker, see what MergeGuard does, and learn how Audiences still count one person. - [Build an audience list that counts each person once](https://www.trymergeguard.com/help/build-an-audience-list): Pick a ready Audiences list, adjust its rules with a live preview, then sync it to Klaviyo or export a CSV. See which audience each MergeGuard plan includes. - [Can I undo a Shopify customer merge? What to do next](https://www.trymergeguard.com/help/can-i-undo-a-merge): Shopify customer merges are permanent. Learn what History and snapshots record, what support can help you check, and which MergeGuard actions can be undone. - [Connect Klaviyo to MergeGuard for Shopify, then pick syncs](https://www.trymergeguard.com/help/connect-klaviyo): Connect Klaviyo to MergeGuard for Shopify on Growth, Scale or Enterprise. Connecting never syncs anything on its own, and you can disconnect from Settings. - [Export an audience list as CSV and count each export](https://www.trymergeguard.com/help/export-an-audience-list-as-csv): Export any MergeGuard audience list as a CSV for another email platform. See which exports count toward your plan and which are open on every plan. - [How the MergeGuard for Shopify free trial works, by plan](https://www.trymergeguard.com/help/how-the-free-trial-works): Starter, Growth and Scale start with a 14-day free trial. See what is included, when the reminder arrives and how repeat trials work for each plan. - [How your MergeGuard for Shopify merge allowance works](https://www.trymergeguard.com/help/how-your-merge-allowance-works): One merge removes one duplicate profile. See how many merges a group uses, when monthly and yearly allowances arrive, and how contact fixes are counted. - [Install MergeGuard for Shopify and see what it can access](https://www.trymergeguard.com/help/install-mergeguard-on-shopify): Install MergeGuard for Shopify from the App Store, see the permissions it asks Shopify for, and check the plan and free allowance you start with. - [How to bulk merge duplicate customers in Shopify: 3 ways](https://www.trymergeguard.com/help/merge-many-duplicate-customers-at-once): Shopify admin merges two profiles at a time. Bulk merge duplicate customers with MergeGuard: whole groups, every strong match in one pass, or automatically. - [Merge repeat profiles in Klaviyo after a Shopify merge](https://www.trymergeguard.com/help/merge-repeat-profiles-in-klaviyo): Merge matching Klaviyo profiles after a Shopify merge. See what can change, what MergeGuard skips and why Klaviyo profile merges are permanent. - [Checklist before merging customers in Shopify: 8 checks](https://www.trymergeguard.com/help/safe-merge-checklist): Shopify customer merges are permanent. Run these 8 checks first: the match, shared emails, kept details, subscriptions, blockers, limits and automation. - [Sync an audience list to Klaviyo and keep it in sync](https://www.trymergeguard.com/help/sync-a-list-to-klaviyo): Send a MergeGuard audience list to Klaviyo when you choose. See the monthly syncs on Growth and Scale, Keep in sync on Scale, and what a sync never changes. - [How to undo a contact fix in MergeGuard for Shopify](https://www.trymergeguard.com/help/undo-a-contact-fix): Use History to undo a contact fix. A contact fix can be undone once, and the undo is its own record that uses 1 fix. Merges are permanent and cannot be undone. - [Upgrade or cancel your MergeGuard for Shopify plan](https://www.trymergeguard.com/help/upgrade-downgrade-or-cancel-your-plan): Change or cancel your MergeGuard plan in Shopify. See when each change takes effect, what stays available and why MergeGuard does not offer refunds. - [Merge Shopify customers: what happens to orders and consent](https://www.trymergeguard.com/help/what-happens-when-you-merge-customers): When Shopify customer profiles merge, orders, addresses, notes and tags move to one profile, a subscribed profile keeps it subscribed, and it can’t be undone. - [What you see after the MergeGuard for Shopify first scan](https://www.trymergeguard.com/help/what-you-see-after-the-first-scan): After the first scan, MergeGuard sorts duplicate groups into Strong, Needs your judgment, New and Protected. Learn what each view means and where to start. - [You ran out of merges: what happens and what to do next](https://www.trymergeguard.com/help/you-ran-out-of-merges): When your MergeGuard allowance runs out, automatic work stops and bulk merges pause. See when new merges arrive and how an upgrade adds merges mid-period. ## Glossary - [Key terms explained: Shopify customer data in plain words](https://www.trymergeguard.com/knowledge/glossary): Plain-words meanings of the customer data terms Shopify merchants meet, from a duplicate customer or a kept profile to repeat purchase rate. - [Active profile: what Klaviyo counts toward your plan](https://www.trymergeguard.com/knowledge/glossary/active-profile): In Klaviyo, an active profile is one that can be emailed, whatever its consent status. See what counts, what drops out and why duplicates raise the count. - [Automatic merging: duplicate customers merged by rule](https://www.trymergeguard.com/knowledge/glossary/automatic-merging): Automatic merging merges strong duplicate matches in Shopify without asking about each one. See what it covers, what it never touches, and when it stops. - [Cohort: customers grouped by first order, explained](https://www.trymergeguard.com/knowledge/glossary/cohort): A cohort is a group of customers who placed their first order in the same period. See how Shopify’s cohort report uses them and what a small store can expect. - [Contact fix: correcting mistyped customer emails in Shopify](https://www.trymergeguard.com/knowledge/glossary/contact-fix): A contact fix corrects a mistyped customer email, like gmial.com to gmail.com, after you confirm it. You can also switch on automatic fixes for domain typos. - [Customer lifetime value (CLV): meaning and a simple formula](https://www.trymergeguard.com/knowledge/glossary/customer-lifetime-value): Customer lifetime value is what one customer brings in over their whole relationship with your store. See a simple formula and how duplicate profiles shrink it. - [Customer merge: what merging profiles does in Shopify](https://www.trymergeguard.com/knowledge/glossary/customer-merge): A customer merge combines Shopify profiles into one customer. See what Shopify combines, why it is permanent, and how marketing status carries over. - [Customer profile: what Shopify records for each shopper](https://www.trymergeguard.com/knowledge/glossary/customer-profile): A customer profile is Shopify’s record of one customer, created when someone interacts with your store. See what starts one and why it holds only one email. - [Data minimisation: keeping only the customer data you need](https://www.trymergeguard.com/knowledge/glossary/data-minimisation): Data minimisation is the data protection principle that personal data be adequate, relevant and limited to what is necessary. See what the UK regulator says. - [Duplicate customers on Shopify: what a duplicate profile is](https://www.trymergeguard.com/knowledge/glossary/duplicate-customer-profile): Duplicate customers are two or more Shopify profiles for one person. Learn how to spot them, how to tell them from relatives, and what to do next. - [Email marketing consent: what it is and how merges affect it](https://www.trymergeguard.com/knowledge/glossary/email-marketing-consent): Email marketing consent is a customer’s recorded agreement to get your marketing emails. See how Shopify carries it through a merge and why that needs care. - [Family members: relatives kept as separate customers](https://www.trymergeguard.com/knowledge/glossary/family-members): In MergeGuard, family members are profiles you marked as not a duplicate because they belong to relatives. Learn why they stay separate and how to mark them. - [Guest checkout: meaning and effect on Shopify customers](https://www.trymergeguard.com/knowledge/glossary/guest-checkout): Guest checkout lets a shopper buy without signing in to an account. Here is what that means for your Shopify customer list and why it can split one shopper. - [Identity resolution: matching records to one real person](https://www.trymergeguard.com/knowledge/glossary/identity-resolution): Identity resolution decides which customer records belong to the same person, using email, phone and address. See how it works in Shopify and email platforms. - [Kept profile: which customer remains after a merge](https://www.trymergeguard.com/knowledge/glossary/kept-profile): The kept profile is the one that remains after you merge duplicate customers. Learn how Shopify decides it and how you choose the details to keep. - [Lapsed customer: what it means and when it is a false alarm](https://www.trymergeguard.com/knowledge/glossary/lapsed-customer): A lapsed customer has gone longer than usual without ordering. See how to judge it per customer and why shoppers buying under another profile only look lapsed. - [List hygiene: keeping an email list accurate and lean](https://www.trymergeguard.com/knowledge/glossary/list-hygiene): List hygiene means keeping your email list accurate: fixing typos, spotting people listed twice and leaving out addresses that never engage. - [Protected profile: customers Shopify won’t let you merge](https://www.trymergeguard.com/knowledge/glossary/protected-profile): A protected profile is a customer Shopify blocks from merging, such as one with a past subscription or store credit. See why, and what you can still do with it. - [Repeat purchase rate: definition, formula and pitfalls](https://www.trymergeguard.com/knowledge/glossary/repeat-purchase-rate): Repeat purchase rate is the share of customers who ordered two or more times in a period. Get the formula and see why duplicate profiles can pull it down. - [Strong match: duplicate groups whose details match closely](https://www.trymergeguard.com/knowledge/glossary/strong-match): A strong match is a MergeGuard duplicate group whose details match closely. Groups where some details differ wait under Needs your judgment for your decision. - [Subscription contract: why it blocks a Shopify merge](https://www.trymergeguard.com/knowledge/glossary/subscription-contract): A subscription contract is the agreement between a customer and a merchant for a subscription. See why Shopify won’t merge a profile that has ever had one. ## Optional - [Cookie policy: what the MergeGuard for Shopify site stores](https://www.trymergeguard.com/legal/cookies): Every cookie and storage item trymergeguard.com sets in your browser, what PostHog analytics records per visit, how long each item lasts, and how to block it. - [Data Processing Agreement for MergeGuard for Shopify](https://www.trymergeguard.com/legal/dpa): How Caelena Software Labs processes your store’s customer data as your processor: instructions, sub-processors, deletion through Shopify, and incident notice. - [Privacy policy for MergeGuard for Shopify and its website](https://www.trymergeguard.com/legal/privacy): How Caelena Software Labs handles data on the MergeGuard website and in the MergeGuard Shopify app: what we collect, why, who gets it, and how it’s deleted. - [Sub-processors: services behind MergeGuard for Shopify](https://www.trymergeguard.com/legal/subprocessors): The companies Caelena Software Labs uses to run the MergeGuard app and website, what each one does, and which data it handles. Updated when the list changes. - [Terms of service for the MergeGuard for Shopify app](https://www.trymergeguard.com/legal/terms): The terms for using MergeGuard for Shopify: permanent merges, your confirmation or automatic merging, plan allowances, billing through Shopify and the trial. - [MergeGuard for Shopify changelog: what’s new, newest first](https://www.trymergeguard.com/whats-new): The MergeGuard for Shopify changelog: new features, changes to how merges, contact fixes and audiences work, and updates to this website, with the newest first.