A: Hey there, you need to buy 3 or more codes to use the API. Your credits on your account can be used for either the API or through the web application (providing you have bought atleast 3 codes).

They are interchangeable and using from the api will remove from the web app remaining credits likewise using from the web app generations will remove from the api, it is the same underlying credit system. There isn't any difference in the credits, you just have the one bag of credits to pull from whether it be api or web app usage.

Hope that helps.