At the moment, you can only edit the address, the notes and change the customer in an order.
Edit address
PATCH /orders/ID/address
{
"shipping": {
"street": "46 Leatherwood St.",
"suite": "1432",
"zip": "91605"
},
"billing": {
"first_name": "James",
"last_name": "C Smith",
"street": "46 Leatherwood St."
}
}
Edit notes
PATCH /orders/ID
{
"notes": "You can write anything here"
}
Change customer
Changing the customer will set their primary address in the order.
PATCH /orders/ID/customer
{
"id": 4071 // ID of the new customer to use
}