Sync Dutchie POS order status via incremental sync polling

Steps

1. Request an API key from an authorized Dutchie account admin through Dutchie's official API key request process; keys are never issued over chat or phone support.
2. Authenticate with HTTP Basic auth, using the API key as the username and an empty password, Base64-encoded in the Authorization header.
3. Call the whoami endpoint first to confirm connectivity and that your key is valid.
4. Poll the incremental sync endpoints using fromLastModifiedDateUTC and toLastModifiedDateUTC filters to pull only orders that changed since your last check.
5. Filter or inspect orders by status (New, Fulfilled, Rejected) to track progress through fulfillment.
6. Mark an order fulfilled through the appropriate endpoint once ready, which notifies integrated systems for pickup or delivery.