I was working with paypal . Everything worked fine , when I changed the settings to sandbox , The code is prompting the following error.
Internal Server Error
I tried searching , people are referring to look the error log but it did not do any good because the error log was empty . Please let me know if there is a fix for this ?
I had an issue like that , The problem was my .htaccess file was corrupted , so I renamed it for the time being. And it worked . Try it . And make a new .htaccess if it helps . I hope it helps.