How do I contact the developer of the App with my App specific Apple ID?

Thank you but I should’ve been more specific. I was asking how to contact the app developer regarding my subscription when they only know me by the Apple generated email ( I think Apple calls it App-specific password) and I’m hiding my own Apple ID email. App developers usually ask for other information from you, in order to identify you and to communicate back with you (ex. name, email, phone number, account number, or copy of the app purchase invoice) defeating the principal behind using the Apple app-specific password. Some app developers overseas also offer to communicate with you over WhatsApp to save you long distance call and text charges, but they get to see your mobile number this way too. 

ill try to upload an example of contact sheet for an overseas app developer. note that all fields are required before one is allowed to send in his request for help

No problem and thanks for jumping in to help me. This issue is really behind me now, since I ended up canceling the app-specific Apple ID and revealed my real Apple ID to the developer in order to create a user name and password with them.

Hopefully Apple can take a note of this issue and introduce corrective measures