Duplicate contact when apply Intercom messenger

Question

We've integrated Intercom Messenger into our web application, using JWTs for authenticated users.The backend flow is designed to find or create an Intercom contact for each user. If a contact doesn't exist, it's created with:{  "user_id": "intercomContactId",  "name": "our_user_email",  "email": "our_user_email",  "external_id": "userId_in_our_system"}This data is then included in the JWT sent to the frontend. The problem is that after several frontend reloads, Intercom creates multiple new contacts with the same user information.

Jacques Reynolds · Accepted Answer

Hey ​@Thinh Tran👋 Jacques here from Intercom Support. I hope all is well today!Here are some things that could help you with this duplicate user issue:First, ensure that theuser_idin your JWT exactlymatches theuser_idin your userdata. Also confirm youruser_idis consistently a string (Intercom expects strings)You could also implement properJWT refresh logictoprevent fallbackto sessioncookiesEnsure Intercom is onlybooted once perpage loaBy implementing these steps, you should beable to prevent the creation of duplicate contacts in Intercom.If the issue persists, I’d recommend reaching out to our support team so they can have a deeper look at your workspace and what is causing issues!

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