这就是我的问题的答案：
我在res.response中获取此数据：

"{"transactionResponse":{"responseCode":"1","authCode":"XXXXXX","avsResultCode":"Y","cvvResultCode":"P","cavvResultCode":"2","transId":"11111111111","refTransID":"","transHash":"","testRequest":"0","accountNumber":"XXXX0002","accountType":"AmericanExpress","messages":[{"code":"1","description":"This transaction has been approved."}],"transHashSha2":"2E6533BDC93C975EE3C1134B7421A337D5B8FB9C257437DB8B4XXXX4BCD92024B33704B811C69E58527359CA8628E8E33E55AA68B881E6F3D15B5F2FEAEB490B","SupplementalDataQualificationIndicator":0,"networkTransId":"HLH5UGDQFZ98LHRLDGIZEG7"},"messages":{"resultCode":"Ok","message":[{"code":"I00001","text":"Successful."}]}}"

 console.log('API', res);
 var obj = eval("(" + res.response + ")");
 console.log(obj);

我解决了这个问题，所以我想我应该要张贴答案，它可能会对别人有帮助。

有一个NPM包“ngx-authorizenet”，它允许您使用Angular Tags从www.example.com发起付款Authorize.net。

//Set up your button in your view
<ngx-authorizenet [config]="authorizenetConfig" (responseHandler)="responseHandler($event)"></ngx-authorizenet>

//Import the module
import { NgxAuthorizenetModule } from 'ngx-authorizenet';

@NgModule({
  imports: [
    NgxAuthorizenetModule,
  ],
})

//YourComponent.component.ts

import { Component, OnInit } from '@angular/core';
import { NgxAuthorizenetI } from 'ngx-authorizenet';

@Component({
  templateUrl: './your.component.html',
})
export class YourComponent implements OnInit {

  public authorizenetConfig?: NgxAuthorizenetI;

  ngOnInit(): void {
    this.initConfig();
  }

  private initConfig(): void {
    this.authorizenetConfig = {
      billingAddressOptions: '{"show":true, "required":false}',
      urlAction: 'https://api.yourdomain.com/authorizepay/callback',
      apiLoginID: 'XXXXXXX',
      clientKey: 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX',
      acceptUIFormBtnTxt: 'Pay Now',
      acceptUIFormHeaderTxt: 'Pay To My Account'
    }
  }

  public authorizeHandler(response) {
    //Visit Api Reference for API Schema
    if (response.messages.resultCode === "Error") {
      var i = 0;
      while (i < response.messages.message.length) {
        console.log(
          response.messages.message[i].code + ": " +
          response.messages.message[i].text
        );
        i = i + 1;
      };

    }
    else {
      performServerSideTransationRequest(response);
    }

  }

然后在上面的控制器类中设置动作处理程序和配置：https://www.npmjs.com/package/ngx-authorizenet?activeTab=readme