I'm facing some problem with payment get way

Ionic Framework ionic-v3
1

I’m facing some problem with payment get way. I use rozarpayment get way. payment method is working perfectly but while i tired to save payment details in db data are not saved please give me any suggestion.

pay() {
    var options = {
      description: 'Credits towards consultation',
      image: 'http://xxxx.ca/tssf/append/images/tssf-icon-1024.png',
      currency: 'INR',
      key: 'rzp_live_xxxxx',// this key need to chage for every app
      
      amount: this.ammout,
      name: 'TSSF',
      prefill: {
        email: this.email,
        contact: this.number,
        name: this.name
      },
      theme: {
        color: '#F37254'
      },
      modal: {
        ondismiss: function() {
          alert('dismissed')
        }
      }
    };
alert(JSON.stringify(options))
    var successCallback = function(payment_id) {
      alert('payment_id: ' + payment_id);
      this.payment_id =payment_id;

      let paymentRecord={
        name:this.name,
        email:this.eamil,
        contact:this.contact,
        payment_id:this.payment_id,
        user_id:this.user_id,
      }
      this.restApi.storepaymentRecord(paymentRecord).subscribe(data=>{

        alert(JSON.stringify(data))
        this.toasService.show('Your transaction is complete Your payment has been successfully!')
      },error=>{
        alert(JSON.stringify(error))
      })
    };

    var cancelCallback = function(error) {
      alert(error.description + ' (Error ' + error.code + ')');
      this.toasService.show(error.description + error.code)
    };

    RazorpayCheckout.open(options, successCallback, cancelCallback);
  }

Any help would be highly appreciated