Register for a PayMaya Manager 2.0 account. Once approved, you will be provided with a Merchant Account.
To activate your PayMaya e-commerce Plugin, you will need to generate API Keys from your PayMaya Manager 2.0. Login to your PayMaya Manager 2.0, select API Keys and input your Merchant ID to generate the API Key you will use to set up your Magento account.
You should see PayMaya Checkout Magento plugin in the Module Manager list (System > Web Setup Wizard > Module Manager). Scroll to the bottom of the last page to see the PayMaya Checkout Module.
Enable the module by clicking the Select box and selecting Enable to let the Magento Plugin be installed and configured.