Payment Gateway | Go SDK - Build Integration

Follow the steps given below to integrate Curlec Payment Gateway with your Go website.

To integrate Curlec Payment Gateway on your Go website:

1.1

Create a Go Directory

1.2

Create an Order in Server

1.3

Add Checkout Options

1.4

Build go.mod file

1.5

Store Fields in Server

1.6

Verify Payment Signature

1.7

Verify Payment Status

1.1 Create a Go Directory

Open the command palette and create a Go project directory with the following files:

main.go
app.html
go.mod files.

1.2 Create an Order in Server

Order is an important step in the payment process.

An order should be created for every payment.
You can create an order using the
Orders API
. It is a server-side API call. Know how to
authenticate
Orders API.
The order_id received in the response should be passed to the checkout. This ties the Order with the payment and secures the request from being tampered.

Handy Tips

You can capture payments automatically with one-time

Payment Capture setting configuration

on the Curlec Dashboard.

API Sample Code

Create a file, for example, main.go and add the API code given below:

client := razorpay.NewClient("YOUR_KEY_ID", "YOUR_SECRET")

data := map[string]interface{}{
  "amount": 50000,
  "currency": "MYR",
  "receipt": "some_receipt_id", 
}
body, err := client.Order.Create(data, nil)

Request Parameters

Here is the list of parameters for creating an order:

amount

mandatory

integer The amount to be paid by the customer in sen. For example, if the amount is MYR 500.00, enter 50000.

currency

mandatory

string The currency in which the payment should be made by the customer. Length must be of 3 characters.

receipt

optional

string Your receipt id for this order should be passed here. Maximum length is 40 characters.

notes

optional

json object Key-value pair that can be used to store additional information about the entity. Maximum 15 key-value pairs, 256 characters (maximum) each. For example, "note_key": "Beam me up Scotty”.

partial_payment

optional

boolean Indicates whether the customer can make a partial payment. Possible values:

true: The customer can make partial payments.
false (default): The customer cannot make partial payments.

first_payment_min_amount

optional

integer Minimum amount that must be paid by the customer as the first partial payment. For example, if an amount of MYR 7,000.00 is to be received from the customer in two installments of #1 - MYR 5,000.00, #2 - MYR 2,000.00 then you can set this value as 500000. This parameter should be passed only if partial_payment is true.

Know more about

Orders API

Response Parameters

Descriptions for the response parameters are present in the

Orders Entity

parameters table.

Error Response Parameters

The error response parameters are available in the

API Reference Guide

1.3 Add Checkout Options

Add the Curlec Checkout options in your project. For example, if you are using HTML for your frontend, create a page called app.html and add the Pay button on your web page using the checkout code and either the:

Callback URL.
Handler Function.

Callback URL or Handler Function

Handy Tips

For FPX payments, you must use the Callback URL sample code for checkout. You should send the following parameters along with the other checkout parameters:

callback_url with the URL to which customers should be redirected after payment completion.
redirect with the value as true.

Code to Add Pay Button

Copy-paste the parameters as options in your code:

<button id="rzp-button1">Pay with Curlec</button>
<script src="https://checkout.razorpay.com/v1/checkout.js"></script>
<script>
var options = {
    "key": "YOUR_KEY_ID", // Enter the Key ID generated from the Dashboard
    "amount": "50000", // Amount is in sen. Default currency is MYR. Hence, 50000 refers to 50000 sen.
    "currency": "MYR",
    "name": "Acme Corp",
    "description": "Test Transaction",
    "image": "https://example.com/your_logo",
    "order_id": "order_IluGWxBm9U8zJ8", //This is a sample Order ID. Pass the `id` obtained in the response of Step 1
    "callback_url": "https://eneqd3r9zrjok.x.pipedream.net/",
    "redirect": true,
    "prefill": {
        "name": "Siti Aisyah",
        "email": "siti.aisyah@example.com",
        "contact": "+601113455567"
    },
    "notes": {
        "address": "Curlec Corporate Office"
    },
    "theme": {
        "color": "#3399cc"
    }
};
var rzp1 = new Razorpay(options);
document.getElementById('rzp-button1').onclick = function(e){
    rzp1.open();
    e.preventDefault();
}
</script>

Handy Tips

Test your integration using these

test cards

Checkout Options

key

mandatory

string API Key ID generated from the Curlec Dashboard.

amount

mandatory

integer The amount to be paid by the customer in sen. For example, if the amount is MYR 500.00, enter 50000.

currency

mandatory

string The currency in which the payment should be made by the customer. Length must be of 3 characters.

name

mandatory

string Your Business/Enterprise name shown on the Checkout form. For example, Acme Corp.

description

optional

string Description of the purchase item shown on the Checkout form. It should start with an alphanumeric character.

image

optional

string Link to an image (usually your business logo) shown on the Checkout form. Can also be a base64 string if you are not loading the image from a network.

order_id

mandatory

string Order ID generated via

Orders API

prefill

object You can prefill the following details at Checkout.

Boost Conversions and Minimise Drop-offs

Autofill customer contact details, especially phone number to ease form completion. Include customer’s phone number in the contact parameter of the JSON request's prefill object. Format: +(country code)(phone number). Example: “contact": "+601113455567").
This is not applicable if you do not collect customer contact details on your website before checkout, have Shopify stores or use any of the no-code apps.

name

optional

string Cardholder's name to be pre-filled if customer is to make card payments on Checkout. For example, Siti Aisyah.

optional

string Email address of the customer.

contact

optional

string Phone number of the customer. The expected format of the phone number is + {country code}{phone number}. If the country code is not specified, 60 will be used as the default value. This is particularly important while prefilling contact of customers with phone numbers issued outside Malaysia. Examples:

+14155552671 (a valid non-Malaysian number)
+601113455567 (a valid Malaysian number).
If 1113455567 is entered without the country code, +60 is added to it as +601113455567.

method

optional

string Pre-selection of the payment method for the customer. Will only work if contact and email are also pre-filled.
Possible value is card.

notes

optional

object Set of key-value pairs that can be used to store additional information about the payment. It can hold a maximum of 15 key-value pairs, each 256 characters long (maximum).

theme

object Thematic options to modify the appearance of Checkout.

hide_topbar

optional

boolean Used to display or hide the top bar on the Checkout form. This bar shows the selected payment method, phone number and gives the customer the option to navigate back to the start of the Checkout form. Possible values:

true: Hides the top bar
false (default): Displays the top bar.

color

optional

string Enter your brand colour's HEX code to alter the text, payment method icons and CTA (call-to-action) button colour of the Checkout form.

backdrop_color

optional

string Enter a HEX code to change the Checkout's backdrop colour.

modal

object Options to handle the Checkout modal.

backdropclose

optional

boolean Indicates whether clicking the translucent blank space outside the Checkout form should close the form. Possible values:

true: Closes the form when your customer clicks outside the checkout form.
false (default): Does not close the form when customer clicks outside the checkout form.

escape

optional

boolean Indicates whether pressing the escape key should close the Checkout form. Possible values:

true (default): Closes the form when the customer presses the escape key.
false: Does not close the form when the customer presses the escape key.

handleback

optional

boolean Determines whether Checkout must behave similar to the browser when back button is pressed. Possible values:

true (default): Checkout behaves similarly to the browser. That is, when the browser's back button is pressed, the Checkout also simulates a back press. This happens as long as the Checkout modal is open.
false: Checkout does not simulate a back press when browser's back button is pressed.

confirm_close

optional

boolean Determines whether a confirmation dialog box should be shown if customers attempts to close Checkout. Possible values:

true: Confirmation dialog box is shown.
false (default): Confirmation dialog box is not shown.

ondismiss

optional

function Used to track the status of Checkout. You can pass a modal object with ondismiss: function()\{\} as options. This function is called when the modal is closed by the user.

animation

optional

boolean Shows an animation before loading of Checkout. Possible values:

true(default): Animation appears.
false: Animation does not appear.

subscription_id

optional

string If you are accepting recurring payments using Curlec Checkout, you should pass the relevant subscription_id to the Checkout. Know more about

Subscriptions on Checkout

subscription_card_change

optional

boolean Permit or restrict customer from changing the card linked to the subscription. You can also do this from the

hosted page

. Possible values:

true: Allow the customer to change the card from Checkout.
false (default): Do not allow the customer to change the card from Checkout.

callback_url

optional

string Customers will be redirected to this URL on successful payment. Ensure that the domain of the Callback URL is allowlisted. This parameter is mandatory for FPX payments.

redirect

optional

boolean Determines whether to post a response to the event handler post payment completion or redirect to Callback URL. callback_url and redirect parameters are mandatory for FPX payments. Possible values:

true: Customer is redirected to the specified callback URL in case of payment failure. For FPX payments, the redirect parameter should always be sent as true.
false (default): Customer is shown the Checkout popup to retry the payment.

customer_id

optional

string Unique identifier of customer.

remember_customer

optional

boolean Determines whether to allow saving of cards. Can also be configured via the

Dashboard

. Possible values:

true: Enables card saving feature.
false (default): Disables card saving feature.

timeout

optional

integer Sets a timeout on Checkout, in seconds. After the specified time limit, the customer will not be able to use Checkout.

readonly

object Marks fields as read-only.

contact

optional

boolean Used to set the contact field as readonly. Possible values:

true: Customer will not be able to edit this field.
false (default): Customer will be able to edit this field.

optional

boolean Used to set the email field as readonly. Possible values:

true: Customer will not be able to edit this field.
false (default): Customer will be able to edit this field.

name

optional

boolean Used to set the name field as readonly. Possible values:

true: Customer will not be able to edit this field.
false (default): Customer will be able to edit this field.

hidden

object Hides the contact details.

contact

optional

boolean Used to set the contact field as optional. Possible values:

true: Customer will not be able to view this field.
false (default): Customer will be able to view this field.

optional

boolean Used to set the email field as optional. Possible values:

true: Customer will not be able to view this field.
false (default): Customer will be able to view this field.

allow_rotation

optional

boolean Used to rotate payment page as per screen orientation. Applicable from Android SDK version 1.6.4 and above. Possible values:

true: Payment page can be rotated.
false (default): Payment page cannot be rotated.

config

optional

object Parameters that enable configuration of checkout display language.

display

object Child parameter that enables configuration of checkout display language.

language

string The language in which checkout should be displayed. Possible value is en: English.

Handy Tips

The open method of the Razorpay object (rzp1.open()) must be invoked by your site's JavaScript, which may or may not be a user-driven action such as a click.

Configure Payment Methods

Multiple payment methods are available on Curlec Standard Checkout.

The payment methods are fixed and cannot be changed.
You can configure the order or make certain payment methods prominent. Know more about
configuring payment methods
.

Handle Payment Success and Failure

The way the Payment Success and Failure scenarios are handled depends on the

Checkout Sample Code

you used in the last step.

Checkout with Callback URL

If you used the sample code with the callback URL:

Razorpay makes a POST call to the callback URL with the razorpay_payment_id, razorpay_order_id and razorpay_signature in the response object of the successful payment. Only successful authorisations are auto-submitted.

Checkout with Handler Function

If you used the sample code with the handler function:

The customer sees your website page. The checkout returns the response object of the successful payment (razorpay_payment_id, razorpay_order_id and razorpay_signature). Collect these and send them to your server.

Success/Failure Handling Code (Checkout with Handler Function)

"handler": function (response){
    alert(response.razorpay_payment_id);
    alert(response.razorpay_order_id);
    alert(response.razorpay_signature)}

1.4 Build go.mod file

Enter go mod tidy in the command palette and run the command.

This builds the go.mod file and imports the

Razorpay Go SDK

1.5 Store Fields in Server

A successful payment returns the following fields to the Checkout form.

You need to store these fields in your server.
You can confirm the authenticity of these details by verifying the signature in the next step.

razorpay_payment_id

string Unique identifier for the payment returned by Checkout only for successful payments.

razorpay_order_id

string Unique identifier for the order returned by Checkout.

razorpay_signature

string Signature returned by the Checkout. This is used to verify the payment.

1.6 Verify Payment Signature

This is a mandatory step that allows you to confirm the authenticity of the details returned to the checkout for successful payments.

To verify the razorpay_signature returned to you by the checkout:

Create a signature in your server using the following attributes:

Use the SHA256 algorithm, the razorpay_payment_id and the order_id to construct a HMAC hex digest as shown below:

generated_signature = hmac_sha256(order_id + "|" + razorpay_payment_id, secret);

  if (generated_signature == razorpay_signature) {
    payment is successful
  }

If the signature you generate on your server matches the razorpay_signature returned to you by the checkout, the payment received is from an authentic source.

Generate Signature on Your Server

Use the code given below to generate signature on your server:

import ( razorpay "github.com/razorpay/razorpay-go" )
client := razorpay.NewClient("YOUR_KEY_ID", "YOUR_SECRET")

params := map[string]interface{}{
	"razorpay_order_id": "order_IEIaMR65cu6nz3",
	"razorpay_payment_id": "pay_IH4NVgf4Dreq1l",
}

signature := "0d4e745a1838664ad6c9c9902212a32d627d68e917290b0ad5f08ff4561bc50f";
secret := "EnLs21M47BllR3X8PSFtjtbd";
utils.VerifyPaymentSignature(params, signature, secret)

1.7 Verify Payment Status

Handy Tips

On the Dashboard, ensure that the payment status is captured. Refer to the payment capture settings page to know how to

capture payments automatically

You can track the payment status in three ways:

To verify the payment status from the Dashboard:

Log in to the
Dashboard
and navigate to Transactions → Payments.
Check if a Payment Id has been generated and note the status. In case of a successful payment, the status is marked as Captured.

Check if the payment id is generated and the status is captured

Next Steps

Step 2: Test Integration

1. Build Integration