WeChat

General information

To process a purchase through Payment Page by using the WeChat method, the merchant's web service is required to send a request with all required parameters and signature to the ecommpay URL and receive a callback with the result. The full sequence and special aspects of purchase processing are provided below.

Information about the formats of requests and callbacks used for processing payments by using the WeChat method via Payment Page is presented further in this section; general information about working with the Payment Page API is presented in Interaction concepts.

Request format

There are several things you need to consider when sending purchase requests by using the WeChat method:

1. The following parameters required for any payment must be specified:
   • project_id—project identifier obtained from ecommpay during integration
   • payment_id—payment identifier unique within the project
   • payment_currency—payment currency code in the ISO-4217 alpha-3 format
   • payment_amount—payment amount in the smallest currency unit
   • customer_id—customer identifier unique within the project
2. The following parameters required for any payment must be specified: project_id, payment_id, payment_currency, payment_amount, customer_id.
3. In some cases, it is required to specify the language_code parameter—language code to open Payment Page. For more information, see Interface language support.
4. If you need to have the payment form displayed with the WeChat method selected, set the force_payment_method parameter to wechat.
5. Additionally, any other parameters available for working with Payment Page can be used (details).
6. After all target parameters are specified, generate a signature (details).

Thus, a correct request for opening the payment form using the WeChat method must contain the project identifier, basic payment information (identifier, amount, and currency code), customer identifier, language code and signature.

{
   "project_id": 120,
   "payment_id": "580",
   "payment_amount": 1000,
   "payment_currency": "EUR",
   "customer_id": "customer1",
   "language_code": "zh", 
   "signature": "kUi2x9dKHAVNU0FYldOcZzUCwX6R\/ekpZhkIQg=="
}

{
   "project_id": 120,
   "payment_id": "580",
   "payment_amount": 1000,
   "payment_currency": "EUR",
   "customer_id": "customer1",
   "language_code": "zh", 
   "signature": "kUi2x9dKHAVNU0FYldOcZzUCwX6R\/ekpZhkIQg=="
}

Callback format

The WeChat method uses the standard format for callbacks to deliver purchase results. For more information, see Callbacks.

The following is the example of a callback with information about a 100,00 EUR purchase made in the 238 project.

 {
        "project_id": 238,
        "payment": {
            "id": "TEST_154866061847343331",
            "type": "purchase",
            "status": "success",
            "date": "2019-01-28T08:07:22+0000",
            "method": "wechat",
            "sum": {
                "amount": 100,
                "currency": "EUR"
            },
            "description": "TEST_1548660618473453"
        },
        "operation": {
            "id": 9227000002916,
            "type": "sale",
            "status": "success",
            "date": "2019-01-28T08:07:22+0000",
            "created_date": "2019-01-28T08:06:40+0000",
            "request_id": "67af98801524dfa9c5cddb1a09129",
            "sum_initial": {
                "amount": 100,
                "currency": "EUR"
            },
            "sum_converted": {
                "amount": 100,
                "currency": "EUR"
            },
            "provider": {
                "id": 1173,
                "payment_id": "423163569",
                "date": "2019-01-28T08:07:22+0000",
                "auth_code": ""
            },
            "code": "0",
            "message": "Success"
        },
        "signature": "yuuYzrj3kD1cGJrJMo8oJqiyD7GgoTS+mvRA=="
    }

The following is the example of a callback with information about a declined purchase.

{
        "project_id": 238,
        "payment": {
            "id": "TEST_154996862174000",
            "type": "purchase",
            "status": "decline",
            "date": "2019-02-12T10:56:22+0000",
            "method": "wechat",
            "sum": {
                "amount": 10000,
                "currency": "USD"
            },
            "description": "TEST_154996862174000"
        },
        "customer": {
            "id": "1"
        },
        "operation": {
            "id": 9172000003183,
            "type": "sale",
            "status": "decline",
            "date": "2019-02-12T10:56:22+0000",
            "created_date": "2019-02-12T10:56:18+0000",
            "request_id": "11d4aabf869cb74c0681927ad7",
            "sum_initial": {
                "amount": 10000,
                "currency": "USD"
            },
            "sum_converted": {
                "amount": 10000,
                "currency": "USD"
            },
            "provider": {
                "id": 1169,
                "payment_id": "",
                "auth_code": ""
            },
            "code": "20105",
            "message": "Insufficient funds on customer account"
        },
        "signature": "ghmnbvc1oVdS/mE0AlVJRrqn7HiBOEIObz2tN5SLw=="
    }
}

Useful links

The following articles can be useful when implementing purchases via Payment Page:

• Interaction concepts—about the interaction with the payment platform by using Payment Page.
• Signature generation and verification—about the procedure of generating and verifying signatures in requests and callbacks.
• Payment models and statuses—about the types, processing models, and possible statuses of supported payments and operations.
• One-time one-step purchase—about processing of one-time one-step purchases by using Payment Page.
• Information of operations performing—about error and response codes that are used in the payment platform to record information about performing of operations.

General information

To process a purchase through Gate by using the WeChat method, the merchant's web service is required to do the following:

1. Send a request with all the required parameters and signature to the ecommpay URL.
2. Receive an intermediate callback from the payment platform and redirect the customer to the WeChat service.
3. Receive the final callback from the payment platform.

The full sequence and special aspects of purchase processing are provided below.

Information about the formats of requests and callbacks used for processing payments by using the WeChat method via Gate is presented further in this section. General information about working with the Gate API is presented in Interaction concepts.

Request format

There are several things you need to consider when sending purchase requests by using the WeChat method:

1. To initiate each purchase, send a separate POST request to the /v2/payment/wallet/wechat/sale endpoint. This endpoint belongs to the group /v2/payment/wallet/{payment_method}/sale.
2. Each request must include the following objects and parameters:
   • Object general—general purchase information:
     • project_id—project identifier obtained from ecommpay during integration
     • payment_id—payment identifier unique within the project
     • signature—request signature generated after all required parameters are specified (details—in the Signature generation and verification) (details)
   • Object payment—payment information:
     • amount—payment amount in the smallest currency unit
     • currency—payment currency code in the ISO-4217 alpha-3 format
     • description—payment description
   • Object customer—customer information:
     • id—customer identifier unique within the project
     • ip_address—customer IP address relevant for the initiated payment
3. Additionally, depending on the payment processing provider, it is recommended to specify the following objects and parameters:
   • Object customer—customer information:
     • email—customer email address
     • phone—customer phone number, must be specified using a country code and without punctuation or special characters, for example 19121234567, you can read more about the format in the FAQ section

   If any of these parameters are missing, the payment platform may send the list of missing parameters in a callback requesting additional information submission (details are available in Submission of additional payment information).

4. Additionally, any other parameters included in the specification can be used.

Thus, a correct purchase request by using the WeChat method must contain the project identifier, basic payment information (identifier, amount, and currency code), customer information, as well as signature.

{
  "general": {
    "project_id": 200,
    "payment_id": "TEST_1559134591371-pz-2",
    "signature": "leNRGu/zTi7tB7T1HPmvelSMQmmWyDUcq3rJKqtw=="
  },
  "customer": {
    "ip_address": "192.0.2.0",
    "id": "customer123",
    "email": "customer@example.com",
    "phone": "19121234567"
  },
  "payment": {
    "amount": 1000,
    "currency": "EUR",
    "description": "test payment"
  }
}

{
  "general": {
    "project_id": 200,
    "payment_id": "TEST_1559134591371-pz-2",
    "signature": "leNRGu/zTi7tB7T1HPmvelSMQmmWyDUcq3rJKqtw=="
  },
  "customer": {
    "ip_address": "192.0.2.0",
    "id": "customer123",
    "email": "customer@example.com",
    "phone": "19121234567"
  },
  "payment": {
    "amount": 1000,
    "currency": "EUR",
    "description": "test payment"
  }
}

Formats of the customer redirection data

To redirect a customer from the web service to the WeChat site, you must receive a callback from the payment platform containing the display_data array. This array can contain one or more objects with the following parameters:

• type—object type
• title—object title
• data—data corresponding to the object type

The display_data array is formed taking into account the following conditions:

• The object containing data for displaying the QR code is always present in the array. The value of the data parameter depends on the value of the type parameter which can have one of the following values:
  • qr_url—QR code is passed as a link the image. In this case the data parameter contains a URL.
  • qr_img—QR code is passed as an image. In this case the data parameter contains a string encoded using the Base64 scheme.
  • qr_data—QR code is passed as a string. In this case the data parameter contains a string which should be used to generate a QR code on the web service side.
• In addition to the object containing the data for displaying the QR-code the display_data array can contain one or several objects with additional information. The type parameter of such objects is assigned the add_info value, while the data parameter can contain various information.
• If the array contains one or more objects with additional information, then the array includes an object with the information on the lifespan of the QR code (starting when the code is created on the WeChat side). The title parameter of such an object is assigned the QR Code Timeout value, while the lifespan is specified in seconds in the data parameter.

The following is the callback fragment containing the string to be used to generate a QR code as well as the lifespan of the code.

 "display_data": [
            {
                "type": "qr_data",
                "title": "QR code",
                "data": "weixin://wxpay/bizpayurl?pr=dMrSpJG"
            },
            {
                "type": "add_info",
                "title": "QR Code Timeout",
                "data": "600"
            }
        ]

Callback format

The WeChat method uses the standard format for callbacks to deliver purchase results. For more information, see Callbacks.

The following is the example of a callback with information about a 1.00 EUR purchase made in the 238 project.

 {
        "project_id": 238,
        "payment": {
            "id": "TEST_154866061847343331",
            "type": "purchase",
            "status": "success",
            "date": "2019-01-28T08:07:22+0000",
            "method": "wechat",
            "sum": {
                "amount": 100,
                "currency": "EUR"
            },
            "description": "TEST_1548660618473453"
        },
        "operation": {
            "id": 9227000002916,
            "type": "sale",
            "status": "success",
            "date": "2019-01-28T08:07:22+0000",
            "created_date": "2019-01-28T08:06:40+0000",
            "request_id": "67af98801524dfa9c5cddb1a09129",
            "sum_initial": {
                "amount": 100,
                "currency": "EUR"
            },
            "sum_converted": {
                "amount": 100,
                "currency": "EUR"
            },
            "provider": {
                "id": 1173,
                "payment_id": "423163569",
                "date": "2019-01-28T08:07:22+0000",
                "auth_code": ""
            },
            "code": "0",
            "message": "Success"
        },
        "signature": "yuuYzrj3kD1cGJrJMo8oJqiyD7GgoTS+mvRA=="
    }

The following is the example of a callback with information about a declined purchase.

{
        "project_id": 238,
        "payment": {
            "id": "TEST_154996862174000",
            "type": "purchase",
            "status": "decline",
            "date": "2019-02-12T10:56:22+0000",
            "method": "wechat",
            "sum": {
                "amount": 10000,
                "currency": "USD"
            },
            "description": "TEST_154996862174000"
        },
        "customer": {
            "id": "1"
        },
        "operation": {
            "id": 9172000003183,
            "type": "sale",
            "status": "decline",
            "date": "2019-02-12T10:56:22+0000",
            "created_date": "2019-02-12T10:56:18+0000",
            "request_id": "11d4aabf869cb74c0681927ad7",
            "sum_initial": {
                "amount": 10000,
                "currency": "USD"
            },
            "sum_converted": {
                "amount": 10000,
                "currency": "USD"
            },
            "provider": {
                "id": 1169,
                "payment_id": "",
                "auth_code": ""
            },
            "code": "20105",
            "message": "Insufficient funds on customer account"
        },
        "signature": "ghmnbvc1oVdS/mE0AlVJRrqn7HiBOEIObz2tN5SLw=="
    }
}

Useful links

The following articles can be useful when implementing purchases via Gate:

• Interaction concepts—about the interaction with the payment platform by using Gate.
• Signature generation and verification—about the procedure of generating and verifying signatures in requests and callbacks.
• Payment models and statuses—about the types, processing models, and possible statuses of supported payments and operations.
• One-time one-step purchase—about processing of one-time one-step purchases by using Payment Page.
• Information of operations performing—about error and response codes that are used in the payment platform to record information about performing of operations.

General information

To perform a refund through Gate by using the WeChat method, send a request with all required parameters and signature to the ecommpay URL and receive a callback with the result. In some cases, for one payment you can perform only one partial refund, then to make additional refunds for this payment you need to contact the technical support of the payment system. For more information refer to your ecommpay key account manager. The full sequence and special aspects of refund performing are provided below.

Information about the formats of requests and callbacks used for performing refunds by using the WeChat method via Gate is presented further in this section. General information about working with the Gate API is presented in Interaction concepts.

Request format

There are several things you need to consider when sending refund requests by using the WeChat method:

1. To initiate each refund, send a separate POST request to the /v2/payment/wallet/wechat/refund endpoint. This endpoint belongs to the group /v2/payment/wallet/{payment_method}/refund.
2. Each request must include the following objects and parameters:
   • Object general—general refund information:
     • project_id—project identifier obtained from ecommpay during integration
     • payment_id—identifier of the payment that needs to be refundedpayment identifier
     • signature—request signature generated after all required parameters are specified (details—in the Signature generation and verification)
   • Object payment—refund information:
     • description—refund description or comment
     • amount—refund amount in the smallest currency unit (required for a partial refund)
   • Object customer—customer information:
     • ip_address—customer IP address relevant for the initiated refund
3. Additionally, any other parameters included in the specification can be used.

Thus, a correct refund request by using the WeChat method must contain the project and payment identifiers, description of the refund, the customer IP address, signature, and, if necessary, the refund amount.

  "general": {    
    "project_id": 239,    
    "payment_id": "refund_02",   
    "signature": "of8k9xerKSK4SwKJ7KLTZYO56lCv+f1M0Sf/7eg=="
  },  
   "customer": {    
     "ip_address": "192.0.2.0" 
 },  
  "payment": {    
    "amount": 10000,    
    "description": "refund_02"
}

  "general": {    
    "project_id": 239,    
    "payment_id": "refund_02",   
    "signature": "of8k9xerKSK4SwKJ7KLTZYO56lCv+f1M0Sf/7eg=="
  },  
   "customer": {    
     "ip_address": "192.0.2.0" 
 },  
  "payment": {    
    "amount": 10000,    
    "description": "refund_02"
}

Callback format

The WeChat method uses the standard format for callbacks to deliver refund results. For more information, see Callbacks.

The following is the example of a callback with information about a 100.00 USD refund made in the 238 project.

{
        "project_id": 238,
        "payment": {
            "id": "refund_02",
            "type": "purchase",
            "status": "refunded",
            "date": "2019-02-19T14:25:25+0000",
            "method": "wechat",
            "sum": {
                "amount": 10000,
                "currency": "USD"
            },
            "description": "test_02"
        },
        "account": {
            "number": "2626324568"
        },
        "operation": {
            "id": 14153000003282,
            "type": "refund",
            "status": "success",
            "date": "2019-02-19T14:25:25+0000",
            "created_date": "2019-02-19T14:25:24+0000",
            "request_id": "9d11b2ca618ec3ba0f588af8af3c4fc9f5fa58f174",
            "sum_initial": {
                "amount": 10000,
                "currency": "USD"
            },
            "sum_converted": {
                "amount": 10000,
                "currency": "USD"
            },
            "provider": {
                "id": 413,
                "payment_id": "105887607",
                "date": "2019-02-19T14:25:24+0000",
                "auth_code": ""
            },
            "code": "0",
            "message": "Success"
        },
        "signature": "of8k9xerKSKpFBRKLTZYO56lCv+f1M0Sf/7eg=="
    }

The following is the example of a callback with information about a declined refund.

{
        "project_id": 198,
        "payment": {
            "id": "ECT_TEST_15428009030783",
            "type": "purchase",
            "status": "success",
            "date": "2018-11-23T13:46:39+0000",
            "method": "wechat",
            "sum": {
                "amount": 10000,
                "currency": "EUR"
            },
            "description": "ECT_TEST_1542800903078"
        },
        "customer": {
            "id": "1"
        },
        "operation": {
            "id": 13792000002073,
            "type": "refund",
            "status": "decline",
            "date": "2018-11-30T09:25:36+0000",
            "created_date": "2018-11-30T09:25:33+0000",
            "request_id": "d848450ce489a81f86522434873a99f534e2c",
            "sum_initial": {
                "amount": 10000,
                "currency": "EUR"
            },
            "sum_converted": {
                "amount": 10000,
                "currency": "EUR"
            },
            "provider": {
                "id": 413,
                "payment_id": "",
                "auth_code": ""
            },
            "code": "3283",
            "message": "Refund amount more than init amount"
        },
        "signature": "AO081Lg6GT/+VIR1DAqn57Ypq8MxSMtpOBca0mhZ9ag=="
    }

Useful links

The following articles can be useful when implementing refunds via Gate:

• Interaction concepts—about the interaction with the payment platform by using Gate.
• Signature generation and verification—about the procedure of generating and verifying signatures in requests and callbacks.
• Payment models and statuses—about the types, processing models, and possible statuses of supported payments and operations.
• Purchase refunds—about performing of refunds by using Gate.
• Information of operations performing—about error and response codes that are used in the payment platform to record information about performing of operations.

As with other payment methods ecommpay offers, when using the WeChat method, you have several options to analyse the information about payments and operations performed by using the method—alone or in conjunction with other methods.

You can load and analyse all the necessary information in Dashboard, for instance you can use the analytic panels on the Analytics tab to this end.

Also, you can export the information for further analysis by using third party analytical tools. The following options are available:

• Dashboard allows you to download reports in CSV and XLS formats—by using the tools on the Payments tab. You can perform export as a one-time download to your local computer or have payment data regularly exported and delivered to email addresses you specify.
• Data API allows you to have payment information exported in JSON format and delivered to a URL you specify. The payment information is exported by using the /operations/get queries.

If you have any further questions regarding payment data analysis, contact ecommpay technical support.