为什么在使用rest api更新订单状态时increment_id已更改？

I want to update order status to complete using webapi

here is my testing code :

$data = array (
        'entity' =>
        array (
            'entity_id' => $id,
            'status' => 'complete',
        ),
    );

    $this->generateApiToken();

    $ch = curl_init("https://$this->link/rest/V1/orders/");
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array( "Content-Type: application/json",
                                                "Authorization: Bearer " . json_decode($this->token) ));

    $cusJsonData = curl_exec($ch);

and when this code runs, the status updated correctly , but the increment_id changed.

Can anyone help me with this problem?

Please refer below URL for Magento 2 API. I guess there is no such specific API to update order status to complete.

URL: https://devdocs.magento.com/swagger/#/

Go to salesOrderRepositoryV1 or salesOrderManagementV1.

I've just had this on v2.2.5, and put it down to a bug in Magento's API.

To get round this, you need to specify the original increment_id along with the entity_id when doing status updates.

Your JSON should look similar to this:

{
  "entity": {
    "entity_id":23,
    "increment_id":"0000000153",
    "state":"processing",
    "status":"processing"
  }
}

Also, not sure why state and status is required, I just chalk this up to Magento's awful API.