Create and convert a Shopify draft order into a paid order programmatically

This API has logged drift

In-depth guide

Steps

1. Create a draft order via POST /admin/api/2024-01/draft_orders.json with a line_items array (each containing variant_id and quantity), customer id or email, and optionally applied_discount or shipping_address
2. Optionally send an invoice to the customer by POSTing to /admin/api/2024-01/draft_orders/{id}/send_invoice.json which emails a checkout link
3. Apply custom line items (without variant_id) for services or non-catalog items by including title, price, and quantity in the line_items array without a variant_id
4. Complete the draft order as paid by POSTing to /admin/api/2024-01/draft_orders/{id}/complete.json with payment_pending: false to mark it as fully paid and convert it to a real order
5. Retrieve the resulting order ID from the order field on the completed draft order response and use it for subsequent fulfillment workflows
6. To hold the order as unpaid (e.g. net-30 B2B), complete with payment_pending: true and later mark it paid via the order transactions API