We are using rest-api-sdk to integrate the Paypal in Java.
In sandbox mode, we can create a payment but not able to complete the payment.
As shown in the image we are not able to log in to the PayPal account to test the payment and also not able to complete the payment by filling credit card details. By filling credit card details PayPal supposed to redirect to the return url.
Kindly help to solve the issue as we have to go live after PayPal payment integration.