OAuth or API key?

Currently with the Billit API we support 2 ways of authentication. First and ready to use from the moment you create an account is the API Key. Which you can find under you're profile in the Billit Application. (Where to find my API key?) This key is a unique key bound to your account, not to one company in Billit. Meaning you can use the same key for different companies which the account you are using is connected to.

The API Key
If there is more than 1 company linked to your user, you will have to keep in mind that you will have to use the companyID of the relevant company in the header in combination with your API key. Otherwise Billit will take the first one created.

If you want to use the already provided API key for the integration you are building you can find all info here.

How do I get started with the API key

OAuth
Everyone has used OAuth before, even if you did not realize it. Just think of using your Microsoft account when logging into a 3rd party tool so you do not have to create a new secure password.

If you want to use OAuth with the integration you are building you can find all info here.

How do I get started with OAuth?