C# UWP/WinRT HMRC VAT MTD: Submit VAT return for period

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Submit VAT return for period

Documentation: https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/vat-api/1.0#_submit-vat-return-for-period_post_accordion

CURL Command

curl -X POST  https://test-api.service.hmrc.gov.uk/organisations/vat/MY_HMRC_VRN/returns \
-H 'Authorization: Bearer HMRC_ACCESS_TOKEN' \
-H 'Accept: application/vnd.hmrc.1.0+json' \
-H 'Content-Type: application/json' \
-d '{
  "periodKey": "A001",
  "vatDueSales": 105.50,
  "vatDueAcquisitions": -100.45,
  "totalVatDue": 5.05,
  "vatReclaimedCurrPeriod": 105.15,
  "netVatDue": 100.10,
  "totalValueSalesExVAT": 300,
  "totalValuePurchasesExVAT": 300,
  "totalValueGoodsSuppliedExVAT": 3000,
  "totalAcquisitionsExVAT": 3000,
  "finalised": true
}'

C# UWP/WinRT Example

Chilkat.Rest rest = new Chilkat.Rest();
bool success;

//  URL: https://test-api.service.hmrc.gov.uk/organisations/vat/MY_HMRC_VRN/returns
bool bTls = true;
int port = 443;
bool bAutoReconnect = true;
success = await rest.ConnectAsync("test-api.service.hmrc.gov.uk",port,bTls,bAutoReconnect);
if (success != true) {
    Debug.WriteLine("ConnectFailReason: " + Convert.ToString(rest.ConnectFailReason));
    Debug.WriteLine(rest.LastErrorText);
    return;
}

//  See the Online Tool for Generating JSON Creation Code
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.UpdateString("periodKey","A001");
json.UpdateNumber("vatDueSales","105.50");
json.UpdateNumber("vatDueAcquisitions","-100.45");
json.UpdateNumber("totalVatDue","5.05");
json.UpdateNumber("vatReclaimedCurrPeriod","105.15");
json.UpdateNumber("netVatDue","100.10");
json.UpdateNumber("totalValueSalesExVAT","300");
json.UpdateNumber("totalValuePurchasesExVAT","300");
json.UpdateNumber("totalValueGoodsSuppliedExVAT","3000");
json.UpdateNumber("totalAcquisitionsExVAT","3000");
json.UpdateBool("finalised",true);

rest.AddHeader("Content-Type","application/json");
rest.AddHeader("Authorization","Bearer HMRC_ACCESS_TOKEN");
rest.AddHeader("Accept","application/vnd.hmrc.1.0+json");

Chilkat.StringBuilder sbRequestBody = new Chilkat.StringBuilder();
json.EmitSb(sbRequestBody);
Chilkat.StringBuilder sbResponseBody = new Chilkat.StringBuilder();
success = await rest.FullRequestSbAsync("POST","/organisations/vat/MY_HMRC_VRN/returns",sbRequestBody,sbResponseBody);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

int respStatusCode = rest.ResponseStatusCode;
if (respStatusCode >= 400) {
    Debug.WriteLine("Response Status Code = " + Convert.ToString(respStatusCode));
    Debug.WriteLine("Response Header:");
    Debug.WriteLine(rest.ResponseHeader);
    Debug.WriteLine("Response Body:");
    Debug.WriteLine(sbResponseBody.GetAsString());
    return;
}

Chilkat.JsonObject jsonResponse = new Chilkat.JsonObject();
jsonResponse.LoadSb(sbResponseBody);

//  See the Online Tool for Generating JSON Parse Code
string processingDate;
string paymentIndicator;
string formBundleNumber;

processingDate = jsonResponse.StringOf("processingDate");
paymentIndicator = jsonResponse.StringOf("paymentIndicator");
formBundleNumber = jsonResponse.StringOf("formBundleNumber");

Sample JSON Response Body

{
  "processingDate": "2019-02-18T14:37:56.561Z",
  "paymentIndicator": "BANK",
  "formBundleNumber": "948551092841"
}