Each Plan, Customer, Subscription and Charge belongs to a source. A source can be your Payment Provider or the Baremetrics API.

When you want to interact with any of these objects, you must supply the Source in the URL. For example: GET /v1/:source_id/subscriptions

You can get your source_id from the Sources endpoint

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Please note that while you can read data from your Payment Provider sources, you can only modify data that has been added via the API.