Go to Configuration → Plugins → OffAmazon → Global Settings
Fill all necessary fields/parameters:
|Your access key||Access Key (screen below)|
|Your secret key||Secret Key|
|Marketplace||Define country – not every country is supported by this payment!|
|Payment action||One, or two step payment.|
|Updating the payment status||Status of the payment. It can be paid, authorized (confirmation that account has proper amount – amount is not collected), cancelled.|
On the configuration page you may adjust others settings, like size and type of Amazon Payments button, position, additional fee, etc.