Problem

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.

Solution

In order for MemberMouse to connect to Coinbase you need to make sure that your merchant account has been activated. It's a single step form that has to be filled out and activation is immediate. To do this, log into your Coinbase account and from the menu in the upper right corner select Advanced. Then click on the Merchant tab. On that page click the button to activate your account.

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.