Greetings subscription features in a custom app for charging users(not merchats) to subscribe to products (product subscription) does shopify bill the user on the renewal date or we have to do it ourselves. because I have a an app where a user purchased a subscription but was not billed on the renewal date
Topic summary
Main issue: A developer using a custom Shopify app asks whether Shopify automatically bills customers on subscription renewal dates, or if the app must trigger charges via the API. They observed a case where a customer’s renewal charge did not occur.
Clarification: The question concerns billing end users for each subscription interval (product subscriptions), not merchant billing. They are using the Shopify GraphQL API to manage subscriptions.
Response: A support representative from Seal Subscriptions asked which app was involved and noted that apps with “auto-charging” functionality should bill customers automatically. They requested more details to assist.
Update: The developer confirmed they built their own custom app and are not using a third-party subscriptions app.
Key terms: “Auto-charging” refers to automatic recurring billing for subscriptions. The Shopify GraphQL API is Shopify’s data interface used to create and manage resources.
Status: Unresolved. The responsibility for renewal billing in custom apps remains unclear. Next step is for the developer to provide app details or seek guidance on implementing auto-charging in their custom setup.
that not what I meant I meant billing the users for each interval of the duration of the subscription via the api
Hello.
I’m Max - Support representative at Seal Subscriptions.
What subscriptions app are you using currently from which you encountered this issue?
Generally, if the app you are using has the “auto-charging” functionality for other customers, they should get billed automatically.
Kindly let me know, so that I can assist you further. 
we built or own custom app and users purchase product subscription with the shopify graphql api