Adds an item to the user’s cart with optional promotion and payment type.
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
The ID of the item to add to the cart.
Whether the item is promoted. Possible values are '0' (no) and '1' (yes).
0, 1 The type of payment for the item. Possible values are '0' (regular) and '1' (subscription).
0, 1 Item details to be added to the cart.