Updates order attributes like email, special instructions, or addresses
Publishable API key for store access
JWT token for authenticated customers
Unique key for request idempotency. Duplicate requests with the same key return the cached response.
"customer@example.com"
"en"
"Leave at door"
Arbitrary key-value metadata (merged with existing)
{ "source": "mobile_app" }
Line items to upsert (sets quantity for existing variants, creates new line items)
order updated with metadata