We've been approved for the Advanced Commerce API. After receiving the approval, we completed the initial setup requirements (submitted a generic product ID and shared our subscriptions page deep link). When testing the Migrate Subscription to Advanced Commerce endpoint in the sandbox, we receive a 5000000 error. What could be the reason/s for it? There is no information, and the API call we make includes all required parameters. Could it be related to the fact that our new generic product ID status is "Missing Metadata"? Is there a way to understand what the issue is on Apple's side?

We’ve been approved for the Advanced Commerce API and are setting up the generic product identifiers per the guide: https://developer.apple.com/documentation/advancedcommerceapi/setting-up-your-project-for-advanced-commerce#Set-up-generic-product-identifiers We have multiple auto-renewable subscriptions (for simplicity: Product 1, Product 2, etc.). We created a new subscription group for Advanced Commerce and are about to add the subscription(s) inside that group. Should we create one auto-renewable subscription (generic, e.g. subscription.ac) to represent all of our subscriptions, or one generic per product family (e.g., product1.ac, product2.ac, …)? If the answer depends on whether subscribers can hold multiple products simultaneously, please advise which structure supports that (e.g., separate groups). Reporting identifiers / segmentation: In Sales and Trends and Payments & Financial Reports, which identifier(s) will appear after migration: the legacy StoreKit product_id, the new generic product id, and/or the SKU? If we use a single generic subscription for all products, what’s Apple’s recommended way to segment revenue by product (Product 1 vs. Product 2)? If SKUs don’t surface in these reports, should we prefer multiple generics/groups to preserve report-level segmentation?