We're currently trying to add Shopify Billing API to submit our app to the Shopify marketplace, but we cannot find enough instructions on this. We are checking https://shopify.dev/api/admin/graphql/reference/billing/appsubscriptioncreate We're checking the GraphQL Billing API. Could you please help us with it? Do you have any detailed, step-by-step tutorials? The information provided is not enough, unfortunately.
The most important question is: Can we configure the API in PHP?