HI @MTS_Jennifer, Did a little research and found from PayPal docs that - Reference Transactions are enabled by default on Sandbox accounts that were created after December 15, 2015. Also from Subscriptions API docs - Note: You cannot integrate the Subscriptions API with the Billing Plans and Billing Agreements APIs. So not sure what I should do next, hope you will find something in logs. Thanks and waiting for your reply. my sandbox: client-id=AX668KhGIS4VeDAa75MVU1aW9JtBDKIFVPqqtntdOmwuPaOBpuz-_0PK0DaaVu4dgwcMWeStxkn0Kyhh
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