Before you can start integrating Ecster Pay you have to prepare your site. First have a look at the interaction between Ecster and your site when using Ecster Pay.
Before you can make calls against Ecster you will need to request a test account.
All calls to Ecster's API need to be authenticated using your unique merchant key and secret API-key. Go to Request test account page to receive your credentials to Ecster Dashboard where you can generate a secret API-key.
Let's get practical and see some examples.
Go to the next step here.