Use this with Magento installation for versions prior to 2.0. For Test API url and Prod API url use http://demo-api.enauda.com/paymentapi/ and https://paymentapi.enauda.com/paymentapi/ accordingly.
Set your API callback to /coinfidepaymentmethod/payment/callback in your API dashboard.
The server should support TLS 1.2. It means OpenSSL version > 1.0.1 and Curl > 7.43, check the library versions your PHP is compiled against.