getting an error while checkout from website

[enrich]

i integrate paypal php code to my website.while subscribe i reirected to the paypal sandbox site,but it gives me this error everytime.

[MTS_Jennifer]

Hello,

Thank you for posting to the PayPal Sandbox Community.

If you are still receiving an error message with your PHP code, please provide the following:

• Your request (no credentials, no credit card info, no address info)
• Your headers and endpoints
• What product you are integrating (PayPal Checkout, Payflow Pro, Express Checkout, Rest API, etc)
• Merchant ID from your Sandbox business account

With this information we can work on trying to identify the root cause of your issue.

Thank you,

Jennifer

PayPal