Creating a Recharge API Key:
Navigate to Apps > API Tokens and select 'Create an API token'.
Set the required permissions for the new key and click 'Save'.
You must select 'Yes, grant access' on the following warning in order to create the key. Upzelo requires write access in order to apply offers to subscriptions when they are saved, as well as cancelling subscriptions when the customer is lost:
Minimum Permissions / Scopes Required for Recharge API Key