Dear Sir,
I'm a developer and i'm deploying Authorize.net ARB API to client website. When I'm going to transaction it shows the error "Response Text: User authentication failed due to invalid authentication values." What is this issue. I used my test account credentials so it's working fine but when i change the test credential to merchant API login and transaction key it shows the error. I have changed the URL : $host = "api.authorize.net"; $path = "/xml/v1/request.api"; but still shows the same error.
Really Appreciate your quick response.
