We Need to Help For issue in Sandbox Payment Process of my Beta Site.
When i go to create payment after completion of checkout process i sent request to Preapproval url : https://svcs.paypal.com/AdaptivePayments/Pay then it is give me Error Message: "File opening failed = fopen(https://svcs.sandbox.paypal.com/AdaptivePayments/Pay): failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request". i use Adaptive Payment process.
it is working proper in live site but not in beta so We need to change in settings of our paypal account or any other way to solve it please give us solution about it.