Receive POST data inside angular component

I am integrating Payment gateway in Angular version 7.

Payment gateway needs data input like below

requestParameter : MerchantId||CollaboratorID||Encrypted_string


I tried to submit form using ngForm as below, but my request is not posting to Payment gateway url and getting error 404 not found for "http://localhost:4200/direcPayment/" and Session expired message of Payment gateway in a response of that. It's just like if anything is wrong in the request you get session expired message.

<form (ngSubmit)="onSubmit()" method="POST" mt-3>


Behind in the code, I am passing the parameter as required and making http.post call as below. On click of OnSubmit I have called formSubmit with encrypted string

formSubmit( encryptedString) {
const formData = new FormData();
formData.append( 'requestParameter', encryptedString);

this.http.post('direcPayment/', formData, httpFormDataOptions)
.subscribe((resposne) => {
console.log(resposne);
});


}

Inside "httpFormDataOptions" I have added below headers

const httpFormDataOptions = {
headers: new HttpHeaders(),
};
httpFormDataOptions.headers.append('Access-Control-Allow-Origin', '*');
httpFormDataOptions.headers.append('Access-Control-Allow-Methods', 'DELETE, POST, GET, OPTIONS');
httpFormDataOptions.headers.append('Access-Control-Allow-Headers', 'Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With');


/direcPayment refers to my Proxy.config.json file as below

{
"/direcPayment": {
"target": "PaymentGatewayURL",
"secure": true,
"pathRewrite": {"^/direcPayment" : ""},
"changeOrigin": true
},
}


so currently I used ngNoForm and submit the form using action attribute.

So I want to ask two queries

1. 
   Submitting form to payment gateway link using httpClient POST method
   
   
2. 
   Payment Gateway says, if payment is either successful/failure then they will redirect to success/failure URL as POST data in encrypted format, So how to receive data to a specific URL in angular? Is there any way to receive data if someone called my angular URL in both cases either using httpClient Call OR ngNoForm
   

Thanks.

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