Subsciption ID
Is there a way to see your subscription ID for a specific app?
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Your subscriptions:
Settings > Apple ID > Subscriptions
As for seeing a tracking identifier, no, that’s not something generally available. It’s an identifier generated by Apple for a particular developer or publisher (representing “you” to “them”), and is deliberately intended to make it difficult for “them” to track back to “you”; to a user-subscriber:
About Subscriptions and Privacy - Apple Support
For contacting a developer:
How to contact an app developer - Apple Support