Onboarding a Merchant - Shopify Payment APP - Public App

I have created a draft version of a Public App with a Payment Extension and I have enabled the Development Store Review to be able to test the app before submitting it for review and getting it approved .

Following this guide, https://shopify.dev/apps/payments/onboarding-a-merchant-payments-apps#graphql-mutation and the steps below

  • Click on the APP

  • Click Test on Development Store

  • Choose Testing Store

  • Getting a page to allow install and permissions

  • Successfully getting a shopify access token

  • Connecting to the ADMIN api with graphql and enabling payment mutation

The next step is supposed to be :

Once the merchant has completed all the actions required for your app’s onboarding, they must be redirected back to the Shopify admin using the following URL:

https://{shop}.myshopify.com/services/payments_partners/gateways/{api_key}/settings

Doing this however is giving a 404 not found on page as per screen shot below.

I can see that the public app is installed on 1 store however i cannot seem to find it under either alternative payments or offsite payment providers and therefore i cannot proceed with testing.

Does someone have a fix or can maybe help on this problem?

Thank y