Pull TikTok Shop orders and submit fulfillment via the TikTok Shop Partner API

Steps

1. Complete the TikTok Shop OAuth flow to obtain a seller access token with the required order and fulfillment scopes from the Partner Center.
2. Retrieve open orders using the Order API's search/list endpoint with a status filter for `AWAITING_SHIPMENT`; use cursor-based pagination to handle large result sets.
3. For each order, extract `order_id`, line item details, and the shipping address from the order response.
4. When items ship, call the Fulfillment API's ship-package endpoint with the `order_id`, `package_id`, tracking number, and carrier information.
5. Verify fulfillment status by re-querying the order and checking that its status has transitioned to `SHIPPED` or `IN_TRANSIT`.
6. Adhere to the standard tier rate limit (check the current limit in the Partner Center documentation; third-party sources report 100 requests per minute per store for standard tier); use batch endpoints for order status updates where available.