CreateContract

{
  "requireCustomerConfirmation": true,
  "contractList": [
    {
      "contractType": "DirectDebit",
      "contractContent": "CustNo : \r\nSSN: SSN198411090111\r\nAddress: Ice road\r\nPostalcode: 10088\r\nPostalPlace: North pole\r\nBalance: 720.00\r\nNoticeFee: \r\nInterestRate: 5.50\r\nElectronice communication: ",
      "contractNumber": "00000000000001"
    }
  ]
}

var AfterPayApi = require("./afterPay.js");
var apiKeyAuthentication = require("./api_key_filter");

var key = 'CHANGE_ME';
var client = new AfterPayApi().addFilter(apiKeyAuthentication.create(key));
var request = {
  "paymentInfo": {
    "type": "Invoice",
    "directDebit": {
      "bankCode": "GENODEM1GTL",
      "bankAccount": "DE20478601250040154100"
    }
  }
};
var checkoutId = "c8d97ca7-5c50-47de-a1f1-02535a05b1ab";

client.Checkout.createContract(checkoutId, request, 
  function(err, response, httpRequest, httpResponse) {
  });

$LOAD_PATH.unshift File.dirname(__FILE__)
require 'after_pay.rb'
require 'json'

client = AfterPayApi::AfterPay.new(AfterPayApi::ApiKeyCredentials.new('YOUR_API_KEY'))

requestAsJson = '{"paymentInfo":{"type":"Invoice","directDebit":{"bankCode":"GENODEM1GTL","bankAccount":"DE20478601250040154100"}}}'
request = AfterPayApi::Models::CreateContractRequest.deserialize_object(JSON.parse(requestAsJson))

checkoutId = "b58da4c2-f75c-41ea-a537-36013a024c12";

client.checkout.createContract_async(checkoutId, request).then{|response|

}.execute.wait

var key = "CHANGE_ME";
var client = new CheckoutApi(new Configuration() { DefaultHeader = new Dictionary<string, string>() { { "X-Auth-Key", key} } });

var request = new CreateContractRequest(){
  PaymentInfo = new Payment() {
    Type = PaymentMethodType.Invoice,
    DirectDebit = new DirectDebit() {
      BankCode = "GENODEM1GTL",
      BankAccount = "DE20478601250040154100"
    }
  }
};
var checkoutId = "870ed327-0305-4673-b4d7-ac3a21127530";

var responce = client.CheckoutCreateContract(checkoutId, request);