This article cover how to create API Credentials.
1. Navigate to the API section here, or click on Platform Settings > API.
2. Once you click on the green 'Generate a new Key' button, a pop-up will appear with your Client ID and Client Secret Key. Make sure that you save these somewhere as you will not be able to view them again.
That's all there is to it! You can view our documentation here which has information about both the merchant and store API's.