I want to integrate WHMCS with Paypal Payment Gateway.. I did the setup account on paypal: Setup & Verify Business - Bank on Paypal Configure Instant Payment Notifications. Setup Paypal Email, API Username, Password, Signature on WHMCS Force One Time Payments (uncheck) Force Subscriptions (uncheck) Sandbox Mode (uncheck) When i test the payment, it says: Things don't appear to be working at the moment. Please try again later. Tested in Normal & Incognito browser. Shop: https://my.hupercloud.com with domain purchase https://www.paypal.com/webapps/shoppingcart/error?flowlogging_id=7065dc43a6a41&code=ERROR&mfid=1537279807410_7065dc43a6a41 https://www.paypal.com/webapps/shoppingcart/error?flowlogging_id=dfe6b48ea2b3&code=ERROR&mfid=1537277977733_dfe6b48ea2b3
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