bKash - Scenario 1. Purchase with payment instructions

When performing a purchase, the customer follows the payment instructions displayed on the checkout page or in your system (when performing the purchase by using Gate).


Countries and regions	Bangladesh
Payment currencies	BDT
Payment amount limits	Contact your key account manager at Monetix for details. Also you can check the payment amount limits in your project by using Dashboard.
Payment processing time	Contact your key account manager at Monetix for details.
Currency conversion	On the Monetix side
Refund
Onboarding and access fee	Contact your key account manager at Monetix for details.
Special considerations If the customer enters an amount which is different from the amount specified in the purchase request, the payment processing will proceed as described in Handling payments with amount changed by customer. The payment amount in BDT must be strictly integer and multiple of 10.00 BDT. In requests, the payment amount must be specified only in minor currency units! For example, a 95.00 BDT payment amount must be submitted as 9500 in the request. You can check the number of digits for minor currency units for any currency in Currency codes.

Operations support


	Interfaces
	Payment Page	Gate	Dashboard
Purchase

You can check the payment amount limits in your project by using Dashboard. To check your payment amount limits, go to Dashboard, select the Projects section, and then click the Payment methods tab.

The following sections provide more information about the payment processing flow and the analysis of completed payments.

Purchase by using Payment Page

General information

To perform a purchase by using Payment Page with the bKash payment method:

Send a request with all the required parameters and signature to the Monetix URL.
Accept the callback with the purchase result from the payment platform.

The following figure shows the complete purchase processing flow in the bKash payment method.

Figure 1. Purchase processing steps for a purchase by using Payment Page

The customer initiates a purchase in your system.
Your system sends the request for the purchase through Payment Page to the Monetix URL.
The checkout page is displayed to the customer.
The customer chooses to make a purchase with the bKash payment method.
The payment platform forwards the request to the provider service.
The provider service generates the payment instructions to show to the customer and sends them to the payment platform.
The checkout page displays the payment instructions to the customer.
The customer completes the purchase.
The provider service sends the transaction ID to the customer.
The customer enters the transaction ID on the checkout page.
The payment platform forwards the request with the transaction ID to the provider service.
The provider service sends the purchase result information to the payment platform.
The payment platform sends a callback with the payment result to your system.
The payment platform displays the payment result to the customer on the checkout page.

Request

The following table lists the parameters that you need to include in the request for purchase through the checkout page with the bKash payment method.

strictly required—the parameter must be in the initial request.

required—the parameter is required for purchase processing but using it in the initial request is optional. If you don't specify this parameter in your request, the checkout page will contain an additional field for the customer to enter the missing information. For more information on how to act in such cases, see Submission of additional payment information.

optional—the parameter is optional but adding it to the request either makes the payment process more customer-friendly or helps to increase the percentage of successful payments.

Parameter Description

project_id
integer
strictly required

Project ID you obtained from Monetix when integrating.

Example: 1234

payment_id
string
strictly required

Payment ID unique within your project.

Example: payment_47

customer_id
string
strictly required

Unique ID of the customer within your project.

Example: customer_123

customer_first_name
string
strictly required

Customer's first name.

Example: John

customer_last_name
string
strictly required

Customer's last name.

Example: Doe

customer_email
string
strictly required

Customer's email.

Example: johndoe@example.com

customer_account_number
string
required

Customer account number, up to 12 digits, only numeric.

Example: 123456789012

payment_currency
string
strictly required

Code of the payment currency in the ISO-4217 alpha-3 format.

Example: BDT

payment_amount
integer
strictly required

Payment amount in minor currency units without any decimal point or comma except for the cases when the currency doesn't have any minor currency units.

If the currency doesn't have any minor units (i.e. the number of digits for minor currency units is zero), set this parameter to the amount in the major currency units. To check whether the currency has any minor units, see Currency codes.

Example: 1000.00 BDT must be sent as 100000

force_payment_method
string
optional

Parameter that allows you to enforce the bKash payment method for your customer and skip the page with payment method selections.

To enforce the bKash payment method and skip the page with payment method selection, add the force_payment_method parameter to the request and set its value to bkash-wallet. For more information about enforcing payment methods, see Preselecting payment methods.

Example: force_payment_method: 'bkash-wallet'

signature
string
strictly required

Signature created after you've specified all the request parameters. For more information about signature generation, see Signature generation and verification.

You can also add any other optional parameters to the request, if necessary. For the list of all the parameters possible in requests to Payment Page, see Payment Page invocation parameters.

Here is an example of the data from a request to open the checkout page by using EPayWidget:

EPayWidget.run(
	{
		project_id: 1234,
		payment_id: 'payment_47',
		customer_id: 'customer_123',
		customer_first_name: 'John',
		customer_last_name: 'Doe',
		customer_email: 'johndoe@example.com',
		customer_account_number: '123456789012',
		payment_currency: 'BDT',
		payment_amount: 100000,
		force_payment_method: 'bkash-wallet',
		signature: 'kUi2x9dKHAVNU0FYldJrxh4yo+52Kt8KU+Y19vySO/RLUkDJrOcZzUCwX6R/ekpZhkIQg=='
	}
)

Callback

In the bKash payment method, the payment platform returns the purchase result in a callback. For the information about the callback structure, see Callbacks in Payment Page.

Callbacks for this method include account.number parameter that contains customer's account number.

The following is an example of a callback body with information about a successfully completed purchase.

Figure 2. Example of the data from a successful purchase callback

{
    "project_id": 1234,
    "payment": {
        "id": "payment_47",
        "type": "purchase",
        "status": "success",
        "date": "2024-12-07T19:08:45+0000",
        "method": "Bkash",
        "sum": {
            "amount": 100000,
            "currency": "BDT"
        },
        "description": ""
    },
    "customer": {
        "id": "customer_123"
    },
    "operation": {
        "id": 47,
        "type": "sale",
        "status": "success",
        "date": "2024-12-07T19:08:45+0000",
        "created_date": "2024-12-07T19:08:05+0000",
        "request_id": "1a23456bc7890de",
        "sum_initial": {
            "amount": 100000,
            "currency": "BDT"
        },
        "sum_converted": {
            "amount": 100000,
            "currency": "BDT"
        },
        "code": "0",
        "message": "Success",
        "provider": {
            "id": 12345,
            "payment_id": "123abc123-123",
            "auth_code": ""
        }
    },
    "account": {
        "number": "123456789012"
    },
    "signature": "U7HQO7ToISZhMPKdM4XrUKQtoYzFvoB3cs9CRd4xeYG2Q=="
}

The following is an example of a callback for a declined purchase.

Figure 3. Example of the data from a declined purchase callback

{
    "project_id": 1234,
    "payment": {
        "id": "payment_47",
        "type": "purchase",
        "status": "decline",
        "date": "2024-12-07T19:08:45+0000",
        "method": "Bkash",
        "sum": {
            "amount": 100000,
            "currency": "BDT"
        },
        "description": ""
    },
    "customer": {
        "id": "customer_123"
    },
    "operation": {
        "id": 47,
        "type": "sale",
        "status": "decline",
        "date": "2024-12-07T19:08:45+0000",
        "created_date": "2024-12-07T19:08:05+0000",
        "request_id": "1a23456bc7890de",
        "sum_initial": {
            "amount": 100000,
            "currency": "BDT"
        },
        "sum_converted": {
            "amount": 100000,
            "currency": "BDT"
        },
        "code": "20000",
        "message": "General decline",
        "provider": {
            "id": 12345,
            "payment_id": "123abc123-123",
            "auth_code": ""
        }
    },
    "account": {
        "number": "123456789012"
    },
    "signature": "U7HQO7ToISZhMPKdM4XrUKQtoYzFvoB3cs9CRd4xeYG2Q=="
}

Purchase by using Gate

General information

To perform a purchase by using Gate with the bKash payment method:

Send a request with all the required parameters and signature to the Monetix URL.
Show the screen with payment instructions to the customer.
Accept the callback with the purchase result from the payment platform.

The following figure provides the details of the purchase processing flow in the bKash payment method.

Figure 4. Purchase processing flow when performing a purchase by using Gate

The customer initiates a purchase in your system.
Your system sends the purchase request to the Monetix payment platform.
The payment platform sends you a response in which it acknowledges your request and provides the request validation result. (For more information about the response format, see Response structure.)
The payment platform processes the request and forwards it to the provider service.
The provider service generates the payment instructions to show to the customer and sends them to the payment platform.
The payment platform forwards the instructions to your system in the display_data array.
Your system displays the payment instructions to the customer.
The customer completes the purchase.
The provider service sends the transaction ID to the customer.
The customer enters the transaction ID in your system.
Your system sends the request with the transaction ID to the payment platform.
The payment platform sends your system the response in which it acknowledges your request and provides the request validation result. (For more information about the response format, see Response structure.)
The payment platform forwards the request with the transaction ID to the provider service.
The provider service informs the payment platform about the purchase result.
The payment platform sends the callback with the payment result to your system.
Your system sends the payment result to the customer.

Request

This section provides the instructions on how to build the request for purchase with the bKash payment method.


HTTP request method	POST
Request body format	JSON
API endpoint	`/v2/payment/wallet/bkash/sale`
Full API endpoint specification	/v2/payment/wallet/{payment_method}/sale

strictly required—the parameter must be in the initial request.

required—the parameter is required for purchase processing but using it in the initial request is optional. If you omit this parameter from the request, the payment platform will request the parameter by sending your system a callback with the list of all the missing parameters you are required to submit. For more information on how to act in such cases, see Submission of additional payment information.

Object Parameter Description

general
object
strictly required

project_id
integer
strictly required

Project ID you obtained from Monetix when integrating.

Example: 1234

payment_id
string
strictly required

Payment ID unique within your project.

Example: payment_47

signature
string
strictly required

Signature created after you've specified all the request parameters. For more information about signature generation, see Signature generation and verification.

customer
object
strictly required

id
string
strictly required

Unique ID of the customer within your project.

Example: customer_123

ip_address
string
strictly required

IP address of the customer's device.

Example: 198.51.100.47

first_name
string
strictly required

Customer's first name.

Example: John

last_name
string
strictly required

Customer's last name.

Example: Doe

email
string
strictly required

Customer's email.

Example: johndoe@example.com

account
object
required

number
string
required

Customer account number, up to 12 digits, only numeric.

Example: 123456789012

payment
object
strictly required

currency
string
strictly required

Code of the payment currency in the ISO-4217 alpha-3 format.

Example: BDT

amount
integer
strictly required

Payment amount in minor currency units without any decimal point or comma except for the cases when the currency doesn't have any minor currency units.

Example: 1000.00 BDT must be sent as 100000

You can also add any other optional parameters to the purchase request, if necessary. For the list of all the parameters available in Gate, see API Reference.

Here is an example of the data from a request to initiate a purchase with the bKash payment method:

Figure 5. Example of the purchase request body

{
    "general": {
        "project_id": 1234,
        "payment_id": "payment_47",
        "signature": "kUi2x9dKHAVNU0FYldJrxh4yo+52Kt8KU+Y19vySO/RLUkDJrOcZzUCwX6R/ekpZhkIQg=="
    },
    "customer": {
        "id": "customer_123",
        "ip_address": "198.51.100.47",
        "first_name": "John",
        "last_name": "Doe",
        "email": "johndoe@example.com"
    },
    "account": {
        "number": "123456789012"
    },
    "payment": {
        "currency": "BDT",
        "amount": 100000
    }
}

Displaying the payment instructions to the customer

After receiving and processing your purchase request, the payment platform sends you the callback with the data for displaying the payment instructions to the customer.

Use the data from the display_data array to display the payment instructions to the customer.

Each element of this array contains the following parameters:

type—element type. its value is always add_info.
title—name of the payment instruction data, can take one the following values:
- account_number—the account number that the customer transfers the funds to
data—payment instruction data

Here is an example of the callback snippet with the data for displaying the payment instructions to the customer.

"display_data": [
    {
        "type": "add_info",
        "title": "account_number",
        "data": "123456789012"
    }
]

Submitting the transaction ID to the payment platform

After you received the transaction ID from the customer, you need to send it to the payment platform in a new request. Listed below are the instructions on how to build the request with the transaction ID.


HTTP request method	POST
Request body format	JSON
API endpoint	/v2/payment/clarification

strictly required—the parameter must be in the initial request.

Object Parameter Description

general
object
strictly required

project_id
integer
strictly required

Project ID you obtained from Monetix when integrating.

Example: 1234

payment_id
string
strictly required

Payment ID unique within your project.

Example: payment_47

signature
string
strictly required

Signature created after you've specified all the request parameters. For more information about signature generation, see Signature generation and verification.

additional_data
object
strictly required

transaction_id
string
strictly required

This parameter must contain transaction ID which the customer obtained from the bKash service.

Example: 123456789012

You can also add any other optional parameters to the request, if necessary. For the list of all the parameters available in Gate, see API Reference.

Here is an example of the data from the request with the transaction ID:

Figure 6. Example of the data from a request with the transaction ID

{
    "general": {
        "project_id": 1234,
        "payment_id": "payment_47",
        "signature": "kUi2x9dKHAVNU0FYldJrxh4yo+52Kt8KU+Y19vySO/RLUkDJrOcZzUCwX6R/ekpZhkIQg=="
    },
    "additional_data": {
        "transaction_id": "123456789012"
    }
}

Callback

In the bKash payment method, the payment platform returns the purchase result in a callback. For the information about the callback structure, see Callbacks in Gate.

Callbacks for this method include account.number parameter that contains customer's account number.

The following is an example of a callback body with the information about a successfully completed purchase.

Figure 7. Example of the data from a successful purchase callback

{
    "project_id": 1234,
    "payment": {
        "id": "payment_47",
        "type": "purchase",
        "status": "success",
        "date": "2024-12-07T19:08:45+0000",
        "method": "Bkash",
        "sum": {
            "amount": 100000,
            "currency": "BDT"
        },
        "description": ""
    },
    "customer": {
        "id": "customer_123"
    },
    "operation": {
        "id": 47,
        "type": "sale",
        "status": "success",
        "date": "2024-12-07T19:08:45+0000",
        "created_date": "2024-12-07T19:08:05+0000",
        "request_id": "1a23456bc7890de",
        "sum_initial": {
            "amount": 100000,
            "currency": "BDT"
        },
        "sum_converted": {
            "amount": 100000,
            "currency": "BDT"
        },
        "code": "0",
        "message": "Success",
        "provider": {
            "id": 12345,
            "payment_id": "123abc123-123",
            "auth_code": ""
        }
    },
    "account": {
        "number": "123456789012"
    },
    "signature": "U7HQO7ToISZhMPKdM4XrUKQtoYzFvoB3cs9CRd4xeYG2Q=="
}

The following is an example of a callback for a declined purchase.

Figure 8. Example of the data from a declined purchase callback

{
    "project_id": 1234,
    "payment": {
        "id": "payment_47",
        "type": "purchase",
        "status": "decline",
        "date": "2024-12-07T19:08:45+0000",
        "method": "Bkash",
        "sum": {
            "amount": 100000,
            "currency": "BDT"
        },
        "description": ""
    },
    "customer": {
        "id": "customer_123"
    },
    "operation": {
        "id": 47,
        "type": "sale",
        "status": "decline",
        "date": "2024-12-07T19:08:45+0000",
        "created_date": "2024-12-07T19:08:05+0000",
        "request_id": "1a23456bc7890de",
        "sum_initial": {
            "amount": 100000,
            "currency": "BDT"
        },
        "sum_converted": {
            "amount": 100000,
            "currency": "BDT"
        },
        "code": "20000",
        "message": "General decline",
        "provider": {
            "id": 12345,
            "payment_id": "123abc123-123",
            "auth_code": ""
        }
    },
    "account": {
        "number": "123456789012"
    },
    "signature": "U7HQO7ToISZhMPKdM4XrUKQtoYzFvoB3cs9CRd4xeYG2Q=="
}

bKash - Scenario 1. Purchase with payment instructions

Operations support

Purchase by using Payment Page

General information

Request

Callback

Related topics

Purchase by using Gate

General information

Request

Displaying the payment instructions to the customer

Submitting the transaction ID to the payment platform

Callback

Related topics