After handling capture request - status is pending in shopify admin

[andreyka26_]

I have the following flow:
1. get payment into my service. I would like to implement authorization and capture. 

2. redirect to gateway and perform payment - then redirect to shopify x_url_complete with query params. Also send callback with data in x-form-urlencoded format.  Both (redirections and callback send Response model as pointed in docs: "https://shopify.dev/docs/hosted-payment-sdk/reference/response-values"). I redirect with "authorization" transaction type and "completed" result. All is okay I got success, and in shopify admin panel I can see Authorization status.
3. If I want to capture it - I click capture and got capture request. I do callback with ResponseModel "https://shopify.dev/docs/hosted-payment-sdk/reference/response-values" with "authorization" transaction type and "completed" (only in this case I didn't receive 422 resp status code). And after doing callback request I just return 200 OK without any body. Then I can see, that my order is in status "pending". Could someone explain what I'm doing wrong?   

  3.1 why in capture request I have different x_reference? If I use it - I also got 422 status code as callback response.

With "sale" mode all is okay - order is paid.

status before capturingpayload for callback in "capture" requestpending status after capture callback resopnse 200 OK