Payment app URL not supported

[akshay-cygnet]

I have create my new Shopify payment app and I am calling graphQL mutations.
I have got an error from Shopify as below,

Action Required: Can you please work with your team to update your urls to point to the Payments Apps API (not Admin API)? This should be a quick change in the URLs used to call the payments mutations for your app(s).

Currently your URL may look like this:
https://<shop_domain>/admin/api/<2021-10 or unstable>/graphql.json

Change it to:
https://<shop_domain>/payments_apps/api/2021-10/graphql.json

Let me know which function we can use for payment_apps URL