Description
The subscription_id field is mentioned in the documentation for Create Test Entitlement but itself remains undocumented. Additionally, the example Entitlement JSON contains additional undocumented fields, namely promotion_id, deleted, and gift_code_flags.
Steps to Reproduce
N/A
Expected Behavior
All entitlement fields should be documented.
Current Behavior
The subscription_id, promotion_id, deleted, and gift_code_flags fields are undocumented.
Screenshots/Videos

Client and System Information
N/A