Hi, @mattcrane!
Welcome to the Veeqo Developer Forum!
I’ve tested this on my account and it is working. Here’s my request data:
{
"order": {
"line_items_attributes": [
{
"sellable_id": 57293219,
"quantity": 1,
"additional_options": "www.veeqo.com"
}
]
}
}
Please ensure you are adding the correct sellable ID to your request, as well as the correct order ID.
To find a sellable ID, make a GET request for the order, and the sellable ID’s are listed under “line_items”. Here’s an example:
"line_items": [
{
"id": 153952194,
"price_per_unit": 21.658,
"quantity": 6,
"tax_rate": 0.2,
"taxless_discount_per_unit": 0.0,
"additional_options": "test te",
"created_at": "2021-09-29T15:59:01.158Z",
"updated_at": "2021-09-29T18:16:24.660Z",
"remote_id": null,
"sellable": {
"allocated_stock_level_at_all_warehouses": 37,
"id": 57293219,
"type": "ProductVariant",
"title": "Default Title",
"sku_code": "MB829Z/A",
"upc_code": "5052089017450",
"model_number": "",
"price": 21.658,
"cost_price": 5.0,
"min_reorder_level": 0,
"quantity_to_reorder": 0,
"created_by_id": 43826,
"created_at": "2021-08-02T09:40:32.111Z",
"updated_at": "2021-09-29T15:59:01.509Z",
"weight_grams": 250.0,
"weight_unit": "g",
"product_title": "Apple Magic Mouse",
...
Hope this helps!