Laravel/Angular - Unprocessable entity - Data is getting sent up, but fails validation

I have an angular app with a Laravel API on the backend. I'm trying to build a payment form. The data is being sent. I see it in the console when I submit the form. But I'm getting the error 422 - Unprocessable entity. Validation rules are failing for town, county, and billing address. But they are in the console.

Payment Component

export class AdvertPaymentComponent implements OnInit {
  advertPaymentForm: FormGroup;
  model: any;
  payment: Payment;
  constructor(private advertService: AdvertService, private alertify: AlertifyService, public authService: AuthService,
    private formBuilder: FormBuilder) { }

  ngOnInit() {
    this.createAdvertPaymentForm();
  }

  createAdvertPaymentForm() {
    this.advertPaymentForm = this.formBuilder.group({
      town: ['', Validators.required],
      county: ['', Validators.required],
      billing_address: ['', Validators.required],
      cardnumber: ['', Validators.required],
      month: ['', Validators.required],
      year: ['', Validators.required],
      cvv: ['', Validators.required],
    });
  }

  submitPayment() {
    if (this.advertPaymentForm.value) {
      this.payment = (Object.assign({}, this.advertPaymentForm.value));
      console.log(this.payment);
      this.advertService.createAdvertPayment(2, this.payment).subscribe(data => {
        this.alertify.success('Success');
      }, error => {
        this.alertify.error(error);
      });
    }
  }
}

Payment HTML

<form [formGroup]="advertPaymentForm" (ngSubmit)="submitPayment()">
    <ng-template matStepLabel>Enter Card Details</ng-template>

      <div class="form-group">
          <input type="text" class="form-control" formControlName="billing_address" placeholder="Billing Address">
      </div>

      <div class="form-group">
          <input type="text" class="form-control" formControlName="town" placeholder="town">
      </div>

      <div class="form-group">
        <input type="text" class="form-control" formControlName="county" placeholder="county">
      </div>

      <div class="form-group">
        <input type="text" class="form-control" formControlName="cardnumber" placeholder="4111111111111111">
    </div>

    <div class="form-group">
      <input type="text" class="form-control" formControlName="month" placeholder="05">
  </div>

  <div class="form-group">
    <input type="text" class="form-control" formControlName="year" placeholder="19">
  </div>

  <div class="form-group">
    <input type="text" class="form-control" formControlName="cvv" placeholder="cvv">
  </div>

  <div class="form-group">
    <input type="text" class="form-control" formControlName="county" placeholder="county">
  </div>
  <button mat-button matStepperNext>Next</button>
</form>

Advert Serice method that is called in the payment component.

createAdvertPayment(propertyId: number, payment: Payment) {
    return this.http.post(this.baseUrl + propertyId + '/payment', {payment});
  }

This is the payment model

export interface Payment {
    town?: string;
    county?: string;
    billing_address: string;
    cardnumber: string;
    month: string;
    year: string;
    cvv: string;
}

This is the laravel function that the is hit from the endpoint

public function ProcessAdvertPayment(Property $property, Request $request, PropertyPaymentRequest $propertyPaymentRequest) {

$payload = $request->input('payload', false);
$nonce = $payload['nonce'];

$payment = Braintree_Transaction::sale([
    'amount' => 1,
    'paymentMethodNonce' => $nonce,
    'creditCard' => ['number' => request('cardnumber'), 'expirationDate' => request('month') . '/' . request('year'), "cvv" => request('cvv')],
]);

if($payment->success)
{
    $property->payment()->create(['amount' => $payment->transaction->amount, 'braintree_transaction_id' => $payment->transaction->id, 'billing_address' => request(['property']->billing_address), 'town' => request('town'), 'county' => request('county')]);
    return response()->json($payment);
} 

return response()->json(['error' => 'Payment Failed. Please try again or contact your payment provider for further help.'], 400);

}

This is a image of the payload

via Chebli Mohamed