How to integrate worldpay with angular2

Question

I am trying to integrate Worldpay in an angular2 app.

I am using own form (own-form) approach where it is necessary to include their script in page: <script src="https://cdn.worldpay.com/v1/worldpay.js"></script> Add specific attibutes for some inputs: data-worldpay and attach the Worldpay.js logic to the form...

I managed to make the steps:
1. Include Worldpay.js in your page
2. Create a payment form with the relevant attributes

How can I continue to make next steps... I am stuck on that problem:

5. Attach Worldpay.js to your form:

<script type="text/javascript">
var form = document.getElementById('paymentForm');

Worldpay.useOwnForm({
  'clientKey': 'your-test-client-key',
  'form': form,
  'reusable': false,
  'callback': function(status, response) {
    document.getElementById('paymentErrors').innerHTML = '';
    if (response.error) {             
      Worldpay.handleError(form, document.getElementById('paymentErrors'), response.error); 
    } else {
      var token = response.token;
      Worldpay.formBuilder(form, 'input', 'hidden', 'token', token);
      form.submit();
    }
  }
});
</script>

Why?
angular2 removes all tags <script from templates.
Supposing with a workaround it would be possible to inject some scripts in page in ngAfterViewInit() method (like i did for 1st step)

ngAfterViewInit(): void {        
  let s = document.createElement("script");
  s.type = "text/javascript";
  s.src = "https://cdn.worldpay.com/v1/worldpay.js";
  this.worldPayScriptElement.nativeElement.appendChild(s);        
}

where this.worldPayScriptElement is a ViewChild of the div from template: <div #worldPayScriptElement hidden></div>

But, As result of their processing rules, worldpay will replace sensitive data from my form with a field called CreditCardToken

From source: Finally, in Worldpay.formBuilder() all sensitive card data is removed from the form, replaced with the token and only then is the form submitted back to your server. source: https://developer.worldpay.com/jsonapi/docs/own-form

How to continue integrating this ... Cannot understand.
If they would have an API returning the CreditCardToken based on a GET/POST request it would be perfect, but from documentation I didn't found yet the right method for that...

I will really appreciate any kind of suggestions.

Answer 1

I have resolved that considering another approach :)

I have used Worldpay API to get the token.
API url: https://api.worldpay.com/v1/tokens

The endpoint waits a POST request in the form:

'{
    "reusable": true/false,
    "paymentMethod": {
        "name": "name",
        "expiryMonth": 2,
        "expiryYear": 2015,
        "issueNumber": 1,
        "startMonth": 2,
        "startYear": 2013,
        "cardNumber": "4444 3333 2222 1111",
        "type": "Card",
        "cvc": "123"
    },
    "clientKey": "T_C_client_key"
}'

where the Header should contain these options: "Content-type: application/json"

Having that, no more need to include worldpay.js in page.
Also, no more need to include in payment form worldpay specific attributes (like data-worldpay="")

Simply should invoke the API, wait for the response, which will have the form:

{
    "token": "UUID of token",
    "reusable": true/false,
    "paymentMethod": {
        "type" : "ObfuscatedCard",     
        "name": "name",
        "expiryMonth": 2,
        "expiryYear": 2015,
        "issueNumber": 1,
        "startMonth": 2,
        "startYear": 2013,
        "cardType": "VISA_CREDIT",
        "maskedCardNumber": "xxxx xxxx xxxx 1111",
        "cardSchemeType": "consumer",
        "cardSchemeName": "VISA CREDIT",
        "cardProductTypeDescNonContactless": "Visa Credit Personal",
        "cardProductTypeDescContactless": "CL Visa Credit Pers",
        "cardIssuer": "LLOYDS BANK PLC",
        "countryCode": "GBR",
        "cardClass": "credit",
        "prepaid": "false"
    }
}

From response you are ready to use the response.token in order to proceed to next step: payment.

You should make sure that specific WorldPay attributes will be sent (CreditCardToken, Enrolled)

How I invoked the worldpay API in angular2?

public getWorldpayToken(request: any): Observable<any>{
    let worldPayApiUrl = `https://api.worldpay.com/v1/tokens`;
    let body = JSON.stringify(request);
    let headers = new Headers({ 'Content-Type':'application/json;charset=UTF-8'});
    let options = new RequestOptions({ headers: headers });

    return this.http.post(worldPayApiUrl, body, options)
      .map(response => response.json())
      .catch(this.handleError);
}

Documentation: https://developer.worldpay.com/jsonapi/api#tokens

For any other details, do not hesitate to comment/ask :)