I have implemented Paytabs integration Via API endpoint but I'm getting "Authentication failed. Check profile ID and authentication header."
This error probably happened because the PayTabs system failed to authenticate/identify the sent request information from your side. it seems that either you passed the wrong integration keys, or you did pass an invalid profile id or API endpoint. To know more about this, Please check our (E): Authentication failed. Check profile ID and authentication header solution article. You may also check How to get my Authentication/Integration/API Keys? and How to get your account information from PT2 Dashboard? solution articles.
I hope this resolves the confusion you have.