I'm setting up a new site with osCommerce. I went into PayPal and got the credentials, put them into the PayPal payment module, but when I checkout, nothing happens: it just redirects back to the shopping cart page with ?error_message= appended to the URL. When I test the credentials in the admin, it says this:
The PayPal Express Checkout credentials are not set up correctly for live production use.
What's the issue? I'm sure I put in the credentials correctly. What mistake might I have made? Is there something in PayPal I haven't set? My credentials look like this:
API Username: user_api1.example.com
API Password: ESXXXXXXXXXXXXKU
What's really confusing is that the error message doesn't give me any information. Version info according to the module:
API Version: 60.0
Thanks for your help