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Issue with app_user_id Query Parameter Causing 404 Error in Web Purchase Link

  • September 24, 2025
  • 2 replies
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I am currently integrating RevenueCat's Web Purchase Links into my Webflow project for handling subscriptions. According to the RevenueCat documentation, I need to append app_user_id as a query parameter to the purchase link to associate the purchase with the correct authenticated user.

Here is the link format I am using: https://pay.rev.cat/sandbox/rim********dasa/?app_user_id=897274573489

Any guidance or suggestions would be greatly appreciated!

Best answer by guilherme

Hey ​@nita-akoh-792301 ,

The appending of the app user id is actually done on the URL path

The app user id is appended as a URL parameter (app_user_id) so you can further customize the post-purchase experience

 as so:

https://pay.rev.cat/<someProductionTokenWeGenerate>/<yourAppUserId>

fields like adding email then yes, should be as query parameters as mentioned in this section here!

Could you try adding the app user id to the URL path instead and see if that works?

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    2 replies

    guilherme
    RevenueCat Staff
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    • guilherme
    • RevenueCat Staff
    • Answer
    • September 26, 2025

    Hey ​@nita-akoh-792301 ,

    The appending of the app user id is actually done on the URL path

    The app user id is appended as a URL parameter (app_user_id) so you can further customize the post-purchase experience

     as so:

    https://pay.rev.cat/<someProductionTokenWeGenerate>/<yourAppUserId>

    fields like adding email then yes, should be as query parameters as mentioned in this section here!

    Could you try adding the app user id to the URL path instead and see if that works?

    Gui, Developer Support Engineer @ RevenueCat
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    Thank you so much for your time and support. It worked.

     

    guilherme
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