To access any resource in Abowire you will need to create a Client ID and a Secret Key. These keys are tied to your account only.
You can create these in Settings > API Keys.
There are two kinds of keys you can create (for backend and for frontend integrations). You can read more about that in the Authentication section.
Note: You can't use your sandbox keys to access the production environment and vice versa. You will need a different set of credentials for each environment.