I'm currently working on e-commerce website and I need to integrate it with paypal.
All I want to do is creating a billing agreement and obtaining billing agreement ID when new user signup for the website.
And to re-issue an invoice with the saved billing agreement ID when they get service.
But I'm getting following error when I call SetExpressCheckout API endpoint for creating a billing agreement.
Merchant not enabled for reference transactions
Some people says, even I'm working on sandbox account, I need to ask paypal to provide reference transaction. And I don't know how.
Please tell me what I have to do.
Thank you in advance.