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Once you’ve set your user up to send out invoices, you can easily add the client that your user wishes to bill. This client’s information can be easily re-used for future invoices, including keeping a card on file.

1. Getting the user’s existing clients

First, you should retrieve a list of the user’s clients. Be sure to include that user’s access_token in the headers.
The response from GET /clients contains an array of the user’s clients:

2. Adding or updating a client

You should update the following fields for any new or existing client: To add or update a client, simply POST the client’s JSON object to the /client endpoint: