woocommerce creat an order of variable products by API

Hi,

I’ve operated shopping page with woocommerce. And now trying to develop an app for customers.

So I’m digging woocommerce REST API.

BTW,

I can’t figure out how can I create an order of variable products by API.

curl -X POST https://example.com/wc-api/v3/orders \
-u consumer_key:consumer_secret \
-H “Content-Type: application/json” \
-d ‘{
(skip)
“line_items”: [
{
“product_id”: 546,
“quantity”: 2
},
{
“product_id”: 613,
“quantity”: 1,
“variations”: {
“pa_color”: “Black”
}
}
],

This is an example of create a paid order from woocommerce REST API document.

Without variation product, I can create an order with API. But with any variable item, I only got this message.

“errors”:[{“code”:”woocommerce_api_missing_callback_param”,”message”:”\uc5c6\ub294 \ub9e4\uac1c\ubcc0\uc218 data”

Even if I created new attribute named “color” and variation “Black” to follow the example exactly, it keeps failed.

How can I solve this problem?

I appreciate your attention and help in advance.