Development Guidelines

Update Time：2025.03.24

1. API Rules

In order to provide a simple, consistent and easy-to-use development experience to merchants while ensuring payment security, we have launched the latest WeChat Pay APIv3 interface. Please refer to “APIv3 Interface Rules” for the specific rules of this API version.

2. Development Environment Setup

To help developers call the open interface, the development libraries of Java、PHP、GO are provided, encapsulating the basic functions such as signature generation, signature verification, encryption/decryption of sensitive information, and media document upload

JAVA

2.1.1. Conditions of Use

WechatPay merchant account

Java 1.8 or later

Maven or Gradle;

0.4.6 or later version of the Java httpClient SDK

2.1.2. Installation

Gradle：Add the following dependencies to your build.gradle document

1implementation 'com.github.wechatpay-apiv3:wechatpay-apache-httpclient:0.4.7'
2

Maven：Add the following dependencies to the pom.xml document

1<dependency>
2<groupId>com.github.wechatpay-apiv3</groupId>
3<artifactId>wechatpay-apache-httpclient</artifactId>
4<version>0.4.7</version>
5</dependency>

2.1.3. Initialization

Initialize WechatPayHttpClientBuilder to create an httpClient, which will be used to send requests to call the WeChatPay interface. Initialize a verifier instance with CertificatesManager to verify the signature.

1
2    private CloseableHttpClient httpClient;
3    private CertificatesManager certificatesManager;
4    private Verifier verifier;
5
6    @Before
7    //initialize verifier and build httpClient
8    public void setup() throws GeneralSecurityException, IOException, HttpCodeException, NotFoundException {
9
10        PrivateKey merchantPrivateKey = PemUtil.loadPrivateKey(privateKey);
11        certificatesManager = CertificatesManager.getInstance();
12        certificatesManager.putMerchant(merchantId, new WechatPay2Credentials(merchantId,
13                        new PrivateKeySigner(merchantSerialNumber, merchantPrivateKey)),
14                apiV3Key.getBytes(StandardCharsets.UTF_8));
15        verifier = certificatesManager.getVerifier(merchantId);
16        WechatPayHttpClientBuilder builder = WechatPayHttpClientBuilder.create()
17                .withMerchant(merchantId, merchantSerialNumber, merchantPrivateKey)
18                .withValidator(new WechatPay2Validator(verifier));
19        httpClient = builder.build();
20    }
21

2.1.4. General Functions

Encrypting Sensitive Information

1
2    @Test
3    public void encryptedTest() throws IllegalBlockSizeException {
4        String text = "helloWorld";
5        String transformation = "RSA/ECB/PKCS1Padding";
6        String encryptedText = RsaCryptoUtil.encrypt(text, verifier.getValidCertificate(), transformation);
7        System.out.println(encryptedText);
8    }
9

Decrypting Sensitive Information

1
2    @Test
3    public void decryptedTest() throws BadPaddingException {
4        String encryptedText = OBTgun4jiN13n3nmSg8v0MNDMy3mbs380yq4GrgO8vwCqXnvrWxwo3jUCNY2UY7MIOtv/SD8ke64MxcSB0hn5EzKv1LOLprI3NvvmNLS4C3SBulxpZG62RYp1+8FgwAI4M//icXvjtZWVH4KVDg==";
5        String transformation = "RSA/ECB/PKCS1Padding";
6        String decryptedText = RsaCryptoUtil.decrypt(encryptedText, PemUtil.loadPrivateKey(privateKey), transformation);
7        assert("helloWorld".equals(decryptedText));
8    }

Golang

2.2.1. Conditions of Use

WechatPay merchant account

GO SDK 0.2.13 or later version

2.2.2. Installation

1、Manage your projects with Go Modules

If Go Modules are not used for the dependency management of your projects, run in the project root directory:

go mod init

2、Without cloning the code in the repository, run directly in the project directory:

go get -u github.com/wechatpay-apiv3/wechatpay-go

to add a dependency, modify modand download SDK

2.2.3. Initialization

Initialize Client and load the merchant account, private key, API V3 key, merchant certificate and serial number to Client for sending an interface request later.

1
2import (
3   "context"
4   "crypto/rand"
5   "crypto/rsa"
6   "crypto/x509"
7   "encoding/base64"
8   "fmt"
9   "github.com/wechatpay-apiv3/wechatpay-go/core"
10   "github.com/wechatpay-apiv3/wechatpay-go/core/option"
11   "github.com/wechatpay-apiv3/wechatpay-go/utils"
12   "log"
13   "net/http"
14)
15
16var (
17   mchID                      = ""                  // merchant id
18   mchCertificateSerialNumber = "" // merchant certificate serial number
19   mchAPIv3Key                = ""                  // merchant api v3 key
20   header                     = make(http.Header)
21   ctx                        = context.Background()
22   cert                       *x509.Certificate
23   mchPrivateKey              *rsa.PrivateKey
24   client                     *core.Client
25   err                        error
26)
27
28func setup() {
29   //Load platform certificate
30   cert, err = utils.LoadCertificateWithPath("Path/To/Platform/Cert")
31   if err != nil {
32      log.Fatal(err)
33   }
34   // Load private key
35   mchPrivateKey, err = utils.LoadPrivateKeyWithPath("Path/To/Private/Key")
36   if err != nil {
37      log.Fatal("load merchant private key error")
38   }
39   // Initialize client which is capable to update platform certificate periodically
40   opts := []core.ClientOption{
41      option.WithWechatPayAutoAuthCipher(mchID, mchCertificateSerialNumber, mchPrivateKey, mchAPIv3Key),
42   }
43   client, err = core.NewClient(ctx, opts...)
44   if err != nil {
45      log.Fatalf("new wechat pay client err:%s", err)
46   }
47}
48

2.2.4. General Functions

Encrypting Sensitive Information

1
2func Encryption(t *testing.T) {
3	var testRSACryptoUtilMchCertificateStr = `-----BEGIN CERTIFICATE-----
4	-----END CERTIFICATE-----`
5	testRSACryptoUtilCertificate, _ = LoadCertificate(testRSACryptoUtilMchCertificateStr)
6   const message = "hello world"
7   
8   // Encrypt the certificate by OAEP padding
9   ciphertext, _ := EncryptOAEPWithCertificate(message, testRSACryptoUtilCertificate)
10   
11  // Encrypt the certificate by PKCS1 padding
12   ciphertext, _ := EncryptPKCS1v15WithCertificate(message, testRSACryptoUtilCertificate)
13}
14

Decrypting Sensitive Information

1
2func TestDecryption(t *testing.T) {
3	var testRSACryptoUtilPrivateKeyStr = `-----BEGIN PRIVATE KEY-----
4-----END PRIVATE KEY-----`
5	testRSACryptoUtilPrivateKey, _ = LoadPrivateKey(testingKey(testRSACryptoUtilPrivateKeyStr))
6	const ciphertext = ""
7
8	// Decrypt the private key by PKCS1 padding
9	decryptMessage, _ := DecryptPKCS1v15(ciphertext, testRSACryptoUtilPrivateKey)
10
11	// Decrypt the private key by OAEP padding
12	decryptMessage, _ := DecryptOAEP(ciphertext, testRSACryptoUtilPrivateKey)
13}

PHP

2.3.1. Conditions of Use

Guzzle 7.0，PHP >= 7.2.5

Guzzle 6.5，PHP >= 7.1.2

PHP 8 is supported.

2.3.2. Installation

It is recommended to use the PHP package management tool Composer to install SDK:

composer require wechatpay/wechatpay

2.3.3. Initialization

Initialize Client and load the merchant account, private key, API V3 key, merchant certificate and serial number to Client in order to send an interface request later.

1
2require_once('vendor/autoload.php');
3
4use WeChatPay\Builder;
5use WeChatPay\Crypto\Rsa;
6use WeChatPay\Util\PemUtil;
7
8$merchantId = '190000****';
9$merchantPrivateKeyFilePath = 'file:///path/to/merchant/apiclient_key.pem';
10$merchantPrivateKeyInstance = Rsa::from($merchantPrivateKeyFilePath, Rsa::KEY_TYPE_PRIVATE);
11$merchantCertificateSerial = '3775B6A45ACD588826D15E583A95F5DD********';
12$platformCertificateFilePath = 'file:///path/to/wechatpay/cert.pem';
13$platformPublicKeyInstance = Rsa::from($platformCertificateFilePath, Rsa::KEY_TYPE_PUBLIC);
14$platformCertificateSerial = PemUtil::parseCertificateSerialNo($platformCertificateFilePath);
15
16// init a API V3 instance
17$instance = Builder::factory([
18    'mchid'      => $merchantId,
19    'serial'     => $merchantCertificateSerial,
20    'privateKey' => $merchantPrivateKeyInstance,
21    'certs'      => [
22        $platformCertificateSerial => $platformPublicKeyInstance,
23    ],
24]); 
25

2.3.4. General Functions

Encrypting Sensitive Information

1
2    $encryptor = static function(string $msg) use ($platformPublicKeyInstance): string {
3        return Rsa::encrypt($msg, $platformPublicKeyInstance, OPENSSL_PKCS1_PADDING);
4    };
5	$encryptedMsg =  $encryptor('HelloWorld');
6

Decrypting Sensitive Information

1
2    $decryptor = static function(string $msg) use ($merchantPrivateKeyInstance): string {
3        return Rsa::decrypt($msg, $merchantPrivateKeyInstance, OPENSSL_PKCS1_PADDING);
4    };
5	$decryptedMsg =  $decryptor('ciphertext');

3. Fast Access

3.1. Business Sequence Chart

3.2. Example of API access

The document shows how to use the WeChat Pay server SDK to In-App Payment by scanning code and interface with WeChat Pay.

Notice

The code examples in the document illustrate the basic usage of API. Before running the code, the example parameters in the code need to be replaced with the merchant's own account and request parameters.

The access steps below are for your information, and should be evaluated and modified according to the merchant’s own business demands.

3.2.1 User identity verification API

Procedure: This interface allows merchants to request WeChat Pay to verify the consistency between the user’s real name for user payment and the identity information involved in the parameter, and merchants can use the correct information for customs clearance based on the verification results.

Sensitive information fields: certificate_id and certificate_name are the sensitive information of users. Such information and the users' privacy should be encrypted and transmitted according to WeChat Pay APIv3 to avoid being intercepted by intermediaries.

Encryption method:

Download the WeChat Pay Platform Certificate, obtain the serial number and public key of certificate

Add the serial number of WeChat Pay Platform Certificate in the HTTP header, Wechatpay-Serial : ${Serial Number of WeChat Pay Platform Certificate}

Use the public key of WeChat Pay Platform Certificate to encrypt the sensitive fields with RSA, and choose RSAES-PKCS1-v1_5 as the padding scheme

Obtain the final content by performing the base64 encoding for ciphertext

Code example-JAVA

1
2//Id info verification API
3    public void idVerification() throws IOException {
4		String verifyIdInfoBody = """{
5  "appid": "wxd678efh567hg6787",
6  "mchid": "1230000109",
7  "out_trade_no": "20150806125346",
8  "transaction_id": "1000320306201511078440737890",
9  "sub_order_no": "20150806125346",
10  "customs": "SHANGHAI_ZS",
11  "merchant_customs_no": "123456",
12  "certificate_type": "IDCARD",
13  "certificate_id": "HHp24MagiQ6i7c5yIow5cJP5x2cGsAA8hi5yIow5cJP5x", // sensitive field, encryption content
14  "certificate_name": "HHp24MagiQ6i7c5yIow/9ZTk5Zt5cJP5x2cGsAA8hif07fRdb2" //sensitive field，encryption content
15}""";
16        HttpPost httpPost = new HttpPost("https://apihk.mch.weixin.qq.com/v3/global/customs/verify-certificate");
17        httpPost.addHeader("Accept", "application/json");
18        httpPost.addHeader("Content-type", "application/json; charset=utf-8");
19        httpPost.addHeader("Wechatpay-Serial", "0798ABFDCBXXXXXXXXXXXXXXXXXXXXXXX054A761");
20        httpPost.setEntity(new StringEntity(verifyIdInfoBody));
21        CloseableHttpResponse response = httpClient.execute(httpPost);
22        //Process the response
23    }
24

Code example-Go

1
2//Call id verification API
3func idVerification() {
4   idVerificationBody := `{
5  "appid": "wxd678efh567hg6787",
6  "mchid": "1230000109",
7  "out_trade_no": "20150806125346",
8  "transaction_id": "1000320306201511078440737890",
9  "sub_order_no": "20150806125346",
10  "customs": "SHANGHAI_ZS",
11  "merchant_customs_no": "123456",
12  "certificate_type": "IDCARD",
13  "certificate_id": "HHp24MagiQ6i7c5yIow5cJP5x2cGsAA8hi5yIow5cJP5x",
14  "certificate_name": "HHp24MagiQ6i7c5yIow/9ZTk5Zt5cJP5x2cGsAA8hif07fRdb2"
15}`
16   header.Add("Wechatpay-Serial", "")
17   header.Add("Idempotency-Key", "20220518-001")
18   result, err := client.Post(ctx, "https://apihk.mch.weixin.qq.com/v3/global/customs/verify-certificate", header, nil, idVerificationBody, "application/json")
19   if err != nil {
20      // Process error
21   }
22   log.Printf("%s", result.Response.Body)
23}

Code example-PHP

1
2//Id info verification API
3public function idInfoVerification($instance, $platformPublicKeyInstance, $platformCertificateSerial){
4    $encryptor = static function(string $msg) use ($platformPublicKeyInstance): string {
5        return Rsa::encrypt($msg, $platformPublicKeyInstance, OPENSSL_PKCS1_PADDING);
6    };
7    try {
8        $resp = $instance
9            ->chain('/v3/global/customs/verify-certificate')
10            ->post([
11                'json' => [
12                    'appid' => 'wxdace12300000000',
13                    'mchid' => '1900000000',
14                    'out_trade_no' => 'YX001',
15                    'transaction_id' => '420000000001500000089',
16                    'customs' => 'SHANGHAI_ZS',
17                    'merchant_customs_no' => '123456',
18                    'sub_order_no' => '20150806125346',
19                    'certificate_type' => 'IDCARD',
20                    'certificate_id' => 'HHp24MagiQ6i7c5yIow5cJP5x2cGsAA8hi5yIow5cJP5x',
21                    'certificate_name' => 'HHp24MagiQ6i7c5yIow/9ZTk5Zt5cJP5x2cGsAA8hif07fRdb2'
22                ],
23                'headers' => [
24                    'Wechatpay-Serial' => $platformCertificateSerial
25                ]
26            ]);
27        echo $resp->getStatusCode(), PHP_EOL;
28        echo $resp->getBody(), PHP_EOL;
29    } catch (\Exception $e) {
30        // Exception handling
31    }
32}

Please refer to the API document for ordering by scanning code for other critical parameters.

3.2.2 API for additional order information submission

Procedure: Merchants request WeChat Pay to push the customs declaration information of payment orders to the Customs through this interface. WeChat Pay will asynchronously push the payment order declaration information to the Customs after receiving the additional information of customs declaration

Code example-JAVA

1
2    //Customs Declaration API
3    public void customsDeclaration() throws IOException {
4		String customsDeclarationBody= """{
5  "appid": "wxd678efh567hg6787",
6  "mchid": "1230000109",
7  "out_trade_no": "20150806125346",
8  "transaction_id": "1000320306201511078440737890",
9  "customs": "SHANGHAI_ZS",
10  "merchant_customs_no": "123456",
11  "duty": 888,
12  "sub_order_no": "20150806125346",
13  "fee_type": "CNY",
14  "order_fee": 888,
15  "transport_fee": 888,
16  "product_fee": 888
17}""";
18        HttpPost httpPost = new HttpPost("https://apihk.mch.weixin.qq.com/v3/global/customs/orders");
19        httpPost.addHeader("Accept", "application/json");
20        httpPost.addHeader("Content-type", "application/json; charset=utf-8");
21        httpPost.setEntity(new StringEntity(customsDeclarationBody));
22        CloseableHttpResponse response = httpClient.execute(httpPost);
23        //Process the response 
24    }
25
26

Code example-Go

1
2//Call customs declaration API
3func customsDeclaration() {
4   customsDeclarationBody := `
5{
6  "appid": "wxd678efh567hg6787",
7  "mchid": "1230000109",
8  "out_trade_no": "20150806125346",
9  "transaction_id": "1000320306201511078440737890",
10  "customs": "SHANGHAI_ZS",
11  "merchant_customs_no": "123456",
12  "duty": 888,
13  "sub_order_no": "20150806125346",
14  "fee_type": "CNY",
15  "order_fee": 888,
16  "transport_fee": 888,
17  "product_fee": 888
18}
19`
20   result, err := client.Post(ctx, "https://apihk.mch.weixin.qq.com/v3/global/customs/orders", customsDeclarationBody)
21   if err != nil {
22      // Process error
23   }
24   log.Printf("%s", result.Response.Body)
25}

Code example-PHP

1
2//Customs Declaration API
3public function customsDeclaration($instance){
4    try {
5        $resp = $instance
6            ->chain('/v3/global/customs/orders')
7            ->post([
8                'json' => [
9                    'appid' => 'wxd678efh567hg6787',
10                    'mchid' => '1230000109',
11                    'out_trade_no' => '20150806125346',
12                    'transaction_id' => '1000320306201511078440737890',
13                    'customs' => 'SHANGHAI_ZS',
14                    'merchant_customs_no' => '123456',
15                    'duty' => 888,
16                    'sub_order_no' => '20150806125346',
17                    'fee_type' => 'CNY',
18                    'order_fee' => 888,
19                    'transport_fee' => 888,
20                    'product_fee' => 888
21                ]
22            ]);
23
24        echo $resp->getStatusCode(), PHP_EOL;
25        echo $resp->getBody(), PHP_EOL;
26    } catch (\Exception $e) {
27        // Exception handling
28    }
29}

Please refer to the API document for ordering by scanning code for other critical parameters.

3.2.3 API for modifying customs declaration information

Procedure: This interface may be called to modify the customs declaration information if the merchant has incorrectly uploaded some fields. This interface allows to modify the following 5 fields only: merchant_customs_no, duty, order_fee, transport_fee, and product_fee

Code example-JAVA

1
2    //Modify Customs Declaration API
3    public void modifyCustomsDeclarartionTest() throws IOException {
4		String modifyCustomsDeclarationBody = "{
5   "appid": "wxd678efh567hg6787",
6   "mchid": "1230000109",
7   "out_trade_no": "20150806125346",
8   "transaction_id": "1000320306201511078440737890",
9   "sub_order_no": "20150806125346",
10   "customs": "SHANGHAI_ZS",
11   "merchant_customs_no": "123456",
12   "duty": 888,
13   "order_fee": 888,
14   "transport_fee": 888,
15   "product_fee": 888
16}";
17        HttpPatch httpPatch = new HttpPatch("https://apihk.mch.weixin.qq.com/v3/global/customs/orders");
18        httpPatch.addHeader("Accept", "application/json");
19        httpPatch.addHeader("Content-type", "application/json; charset=utf-8");
20        httpPatch.setEntity(new StringEntity(modifyCustomsDeclarationBody));
21        CloseableHttpResponse response = httpClient.execute(httpPatch);
22        //Process the response 
23    }
24

Code example-Go

1
2//Modify customs declaration API
3func modifyCustomsDeclarartion() {
4   modifyCustomsDeclarartionBody := `
5{
6   "appid": "wxd678efh567hg6787",
7   "mchid": "1230000109",
8   "out_trade_no": "20150806125346",
9   "transaction_id": "1000320306201511078440737890",
10   "sub_order_no": "20150806125346",
11   "customs": "SHANGHAI_ZS",
12   "merchant_customs_no": "123456",
13   "duty": 888,
14   "order_fee": 888,
15   "transport_fee": 888,
16   "product_fee": 888
17}
18`
19   result, err := client.Patch(ctx, "https://apihk.mch.weixin.qq.com/v3/global/customs/orders", modifyCustomsDeclarartionBody)
20   if err != nil {
21      // Process error
22   }
23   log.Printf("%s", result.Response.Body)
24}

Code example-PHP

1
2//Modify Customs Declaration API
3public function modifyCustomsDeclarartion($instance){
4    try {
5        $resp = $instance
6            ->chain('/v3/global/customs/orders')
7            ->patch([
8                'json' => [
9                    'appid' => 'wxd678efh567hg6787',
10                    'mchid' => '1230000109',
11                    'out_trade_no' => '20150806125346',
12                    'transaction_id' => '1000320306201511078440737890',
13                    'customs' => 'SHANGHAI_ZS',
14                    'merchant_customs_no' => '123456',
15                    'duty' => 888,
16                    'sub_order_no' => '20150806125346',
17                    'order_fee' => 888,
18                    'transport_fee' => 888,
19                    'product_fee' => 888
20                ]
21            ]);
22
23        echo $resp->getStatusCode(), PHP_EOL;
24        echo $resp->getBody(), PHP_EOL;
25    } catch (\Exception $e) {
26        // Exception handling
27    }
28}

Please refer to the API document for ordering by scanning code for other critical parameters.

3.2.4 API for querying additional order information

Procedure: This interface allows merchants to query the additional customs declaration information submitted, as well as the status of customs declaration.

Code example-JAVA

1
2    //Query Customs Declaration API
3    public void queryCustomsDeclarationTest() throws IOException {
4        HttpGet httpGet = new HttpGet("https://apihk.mch.weixin.qq.com/v3/global/customs/orders?appid=wxd678efh567hg6787&mchid=mchid&order_type=transaction_id&order_no=1000320306201511078440737890&customs=SHANGHAI_ZS&offset=1&limit=20");
5        httpGet.addHeader("Accept", "application/json");
6        httpGet.addHeader("Content-type", "application/json; charset=utf-8");
7        CloseableHttpResponse response = httpClient.execute(httpGet);
8        //Process the response 
9    }
10

Code example-Go

1
2//Call query customs declaration API
3func queryCustomsDeclaration() {
4   result, err := client.Get(ctx, "https://apihk.mch.weixin.qq.com/v3/global/customs/orders?appid=wxd678efh567hg6787&mchid=mchid&order_type=transaction_id&order_no=1000320306201511078440737890&customs=SHANGHAI_ZS&offset=1&limit=20")
5   if err != nil {
6      // Process error
7   }
8   log.Printf("%s", result.Response.Body)
9}

Code example-PHP

1
2//Query Customs Declaration API
3public function queryCustomsDeclaration($instance){
4    try {
5        $resp = $instance
6            ->chain('/v3/global/customs/orders')
7            ->get([
8                'query' => [
9                    'mchid' => '1900000000',
10                    'appid' => 'wxd678efh567hg6787',
11                    'order_type' => 'transaction_id',
12                    'order_no' => '1000320306201511078440737890',
13                    'customs' => 'SHANGHAI_ZS',
14                    'offset' => 1,
15					'limit' => 20
16                ]
17            ]);
18        echo $resp->getStatusCode(), PHP_EOL;
19        echo $resp->getBody(), PHP_EOL;
20    } catch (\Exception $e) {
21        // Exception handling
22    }
23}

Please refer to the API document for ordering by scanning code for other critical parameters.

3.2.5 API for re-pushing additional order information

Procedure: When an order has been declared and the Customs requires the merchant to re-push the declaration information, this interface allows the merchant to re-send the declaration information to the Customs.

Code example-JAVA

1
2    //Repush Customs Declaration API
3    public void repushCustomsDeclarartionTest() throws IOException {
4		String repushBody = """
5{
6  "appid": "wxd678efh567hg6787",
7   "mchid": "1230000109",
8   "out_trade_no": "20150806125346",
9   "transaction_id": "1000320306201511078440737890",
10   "sub_order_no": "20150806125346",
11   "sub_order_id": "1000320306201511078440737891",
12   "customs": "SHANGHAI_ZS",
13   "merchant_customs_no": "123456"
14}
15""";
16        HttpPost httpPost = new HttpPost("https://apihk.mch.weixin.qq.com/v3/global/customs/redeclare");
17        httpPost.addHeader("Accept", "application/json");
18        httpPost.addHeader("Content-type", "application/json; charset=utf-8");
19        httpPost.setEntity(new StringEntity(repushBody));
20        CloseableHttpResponse response = httpClient.execute(httpPost);
21        //Process the response 
22    }
23

Code example-Go

1
2//Repush customs declaration API
3func repushCustomsDeclarartion() {
4   repushBody := `
5{
6  "appid": "wxd678efh567hg6787",
7   "mchid": "1230000109",
8   "out_trade_no": "20150806125346",
9   "transaction_id": "1000320306201511078440737890",
10   "sub_order_no": "20150806125346",
11   "sub_order_id": "1000320306201511078440737891",
12   "customs": "SHANGHAI_ZS",
13   "merchant_customs_no": "123456"
14}
15`
16   result, err := client.Post(ctx, "https://apihk.mch.weixin.qq.com/v3/global/customs/redeclare", repushBody)
17   if err != nil {
18      // Process error
19   }
20   log.Printf("%s", result.Response.Body)
21}

Code example-PHP

1
2//Repush Customs Declaration API
3public function repushCustomsDeclarartion($instance){
4    try {
5        $resp = $instance
6            ->chain('v3/global/customs/redeclare')
7            ->post([
8                'json' => [
9                    'mchid' => '1230000109',
10                    'appid' => 'wxd678efh567hg6787',
11                    'out_trade_no' => '20150806125346',
12                    'transaction_id' => '1000320306201511078440737890',
13                    'sub_order_no' => '20150806125346',
14                    'sub_order_id' => '1000320306201511078440737891',
15                    'customs' => 'SHANGHAI_ZS',
16                    'merchant_customs_no' => '123456'
17                ]
18            ]);
19        echo $resp->getStatusCode(), PHP_EOL;
20        echo $resp->getBody(), PHP_EOL;
21    } catch (\Exception $e) {
22        // Exception handling
23    }
24}

Please refer to the API document for ordering by scanning code for other critical parameters.