User-Presented Mode Payment (B scan C)

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Accept in-store payments from Alipay+ users through your point-of-sale system (POS) using the Alipay+ User-Presented Mode Payment (B scan C) payment method.

This guide walks you through the payment flow and details on how to implement.

How to enable

  • Supported Countries: Thailand, Singapore, Malaysia
  • Minimum API version: 2017-11-02
Supported Wallets Thailand Singapore Malaysia
Alipay CN
Alipay HK
Touch 'n Go

To enable User-Presented Mode Payment (B scan C), send an email requesting this feature to You will need to review and accept new terms and conditions.

Payment flow

Customers paying via User-Presented Mode Payment (B scan C) present their payment code (barcode or QR code) to you. You must scan the payment code using a barcode reader and use it to create a new charge.

Alipay+ UPM

❶ The customer opens an Alipay+ supported wallet on their mobile phone. ❷ Then, the customer chooses to generate a QR code in the wallet application and displays to the merchant. ❸ The merchant scans the QR code with QR code reader. ❹ The customer confirms payment in the wallet application. ❺ When the payment is successful, the customer will be notified in the wallet application.


To create a charge using User-Presented Mode Payment (B scan C), make the following API requests.

  1. Create a new charge specifying the required parameters.
  2. After receiving the charge completion webhook event, retrieve the charge to verify its status (optional, but recommended).

Use your secret key to create the User-Presented Mode Payment (B scan C) charge.

Creating a charge

When the payer confirms they wish to use this payment method, create a new charge specifying the following parameters: amount, currency, source[type] (alipayplus_upm), and source[barcode].

Parameter Type Description
amount integer (required) Amount in subunits of source currency
currency string (required) Currency for source as three-letter ISO 4217 code (THB for Thailand, SGD for Singapore, MYR for Malaysia)
source[type] string (required) Payment source type alipayplus_upm
source[barcode] string (required) Payment code (barcode) number read by your scanner

The following example demonstrates how to create a new charge using curl. Replace $OMISE_SECRET_KEY with the test secret key found on your dashboard.

curl \
  -d "amount=150000" \
  -d "currency=THB" \
  -d "source[type]=alipayplus_upm" \
  -d "source[barcode]=2897991359827699709"
  "object": "charge",
  "id": "chrg_test_5x62vqssjobx39qxez2",
  "location": "/charges/chrg_test_5x62vqssjobx39qxez2",
  "amount": 150000,
  "net": 147352,
  "fee": 2475,
  "fee_vat": 173,
  "interest": 0,
  "interest_vat": 0,
  "funding_amount": 150000,
  "refunded_amount": 0,
  "transaction_fees": {
    "fee_flat": "0.0",
    "fee_rate": "1.65",
    "vat_rate": "7.0"
  "platform_fee": {
    "fixed": null,
    "amount": null,
    "percentage": null
  "currency": "THB",
  "funding_currency": "THB",
  "ip": null,
  "refunds": {
    "object": "list",
    "data": [],
    "limit": 20,
    "offset": 0,
    "total": 0,
    "location": "/charges/chrg_test_5x62vqssjobx39qxez2/refunds",
    "order": "chronological",
    "from": "1970-01-01T00:00:00Z",
    "to": "2023-09-20T04:09:11Z"
  "link": null,
  "description": null,
  "metadata": {},
  "card": null,
  "source": {
    "object": "source",
    "id": "src_test_5x62vqs5azkr2mavd6m",
    "livemode": false,
    "location": "/sources/src_test_5x62vqs5azkr2mavd6m",
    "amount": 150000,
    "barcode": "2897991359827699709",
    "bank": null,
    "created_at": "2023-09-20T04:09:10Z",
    "currency": "THB",
    "email": null,
    "flow": "offline",
    "installment_term": null,
    "ip": null,
    "absorption_type": null,
    "name": null,
    "mobile_number": null,
    "phone_number": null,
    "platform_type": null,
    "scannable_code": null,
    "billing": null,
    "shipping": null,
    "items": [],
    "references": null,
    "provider_references": null,
    "store_id": null,
    "store_name": null,
    "terminal_id": null,
    "type": "alipayplus_upm",
    "zero_interest_installments": null,
    "charge_status": "pending",
    "receipt_amount": null,
    "discounts": []
  "schedule": null,
  "customer": null,
  "dispute": null,
  "transaction": null,
  "failure_code": null,
  "failure_message": null,
  "status": "pending",
  "authorize_uri": null,
  "return_uri": null,
  "created_at": "2023-09-20T04:09:10Z",
  "paid_at": null,
  "expires_at": "2023-09-27T04:09:10Z",
  "expired_at": null,
  "reversed_at": null,
  "zero_interest_installments": false,
  "branch": null,
  "terminal": null,
  "device": null,
  "authorized": false,
  "capturable": false,
  "capture": true,
  "disputable": false,
  "livemode": false,
  "refundable": false,
  "reversed": false,
  "reversible": false,
  "voided": false,
  "paid": false,
  "expired": false

Setting the charge to expire

User-Presented Mode Payment (B scan C) charges that have not yet been authorized (status=pending) can be set to expire immediately. In effect, this cancels the charge.

curl$CHARGE_ID/expire \
  -X POST \

Completing the charge

At this point, you have created a new charge with its status set to pending. Other possible values for charge status are successful, failed, and expired.

The following sections detail how to authorize a charge, receive its completion webhook event, and update its status.

This sequence diagram shows the entire flow.

sequenceDiagram participant customer participant merchant participant participant payment provider customer->>merchant: Present payment code for scanning merchant->> Create charge using payment code>>merchant: Return charge Send "charge.create" webhook customer->>payment provider: Provide charge authorization payment provider-->>customer: Return payment result payment provider-->> Return payment result Send "charge.complete" webhook

Receiving the charge completion event

The best way for you to be notified of the completion of a charge is using webhook events. Set up a location on your server to receive webhook events, and add this location as a webhook endpoint on the dashboard.

Once a charge is completed, a POST request will be sent to this endpoint with the charge response embedded.

The key attribute for the event object contains charge.complete and the data attribute contains the charge object. See Events API for event object structure.

Checking the charge status

After receiving this event, retrieve the charge using its id and confirm that its status matches the status of the charge contained in the event.

If the value of status is successful, you got paid. If the value of status is failed, check the failure_code and failure_message in the charge object for an explanation.

Possible failure codes are listed below.

Failure Code Description
payment_expired Payment expired.
payment_rejected Payment rejected by issuer.
insufficient_fund Insufficient funds in the account or the payment method has reached its limit.
failed_processing General payment processing failure.

Voids and refunds

User-Presented Mode Payment (B scan C) charges can be voided until 16:15 UTC of the transaction date, and can be partially or fully refunded within 1 year of the transaction date.



  • Minimum: 2000 (THB 20.00)
  • Maximum: 15000000 (THB 150,000.00)


  • Minimum: 100 (SGD 1.00)
  • Maximum: 2000000 (SGD 20,000.00)


  • Minimum: 100 (MYR 1.00)
  • Maximum: 3000000 (MYR 30,000.00)

Next steps

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