When saving Coinbase settings I'm getting the following error message:

Coinbase denied access for those API credentials.
Please make sure your merchant account has been activated and that you gave "buttons" permissions when you created that API key.


In order for MemberMouse to connect to Coinbase you need to make sure that your merchant account has been activated. The support team at Coinbase can let you know if this feature is available to be activated, and, if so, how to do that. 

If your account has been activated already then verify that you've copied your API credentials correctly and they have the appropriate permissions as outlined in this article: Configuring Coinbase.