PayWhirl has an API available for developers to help access (read/write) the data within your paywhirl account. You can generate an API secret key from your My Account page which can be accessed by clicking your email address in the top right of the PayWhirl Dashboard. To enable access click the blue "Create API Secret" button...

For details on how to interact with the API view the API Reference Sheet.
Note: This feature is currently in beta and has limited support.