Typically once a year Amazon will require you to renew any third-party applications on your Seller Central account.
If the API connection has been disconnected or needs to be renewed you should see the below pop-up on your Payability dashboard when you first log in:
When you click on 'Connect Amazon APl', you will be required to log into your Amazon account with the email address connected to the main user of your account. Following this prompt will reestablish the API connection. Please email the Support Team once this is completed so we can ensure all applicable sales have been advanced. Please note that your Payability account will not be updated until the API is connected.