Step 1:Obtaining Signing Session ID API

API Intro

Request Url:https://apihk.mch.weixin.qq.com/v3/global/papay/contracts/app-pre-entrust-sign

Request method:POST

API rules: https://wechatpay-api.gitbook.io/wechatpay-api-v3

Applicable object:Common modeInstitutional mode

path parameter is a path parameter.

query parameter needs to be passed in the request URL.

body parameter needs to be passed in the request JSON.

UML

Request Parameters

Example：

 {
  "appid": "wxcbda96de0b165486",
  "expired_time": "2021-11-20T13:29:35+08:00",
  "openid": "ouFhd5X9s9WteC3eWRjXV3lea123",
  "out_contract_code": "100001256",
  "plan_id": 123,
  "return_url": "https://yoursite.com",
  "success_notify_url": "https://yoursite.com",
  "user_display_name": "張三"
}
                              

 {
  "expired_time": "2021-11-20T13:29:35+08:00",
  "openid": "ouFhd5X9s9WteC3eWRjXV3lea123",
  "out_contract_code": "100001256",
  "plan_id": 123,
  "return_url": "https://yoursite.com",
  "sp_appid": "wxcbda96de0b165486",
  "sub_appid": "wxcbda96de0b165484",
  "sub_mchid": "10000097",
  "success_notify_url": "https://yoursite.com",
  "user_display_name": "張三"
}
                              

Return Data

Normal return

Example：

{
  "session_id": "201710180325670965"
}
                                

Step 2:Obtaining Signing Session ID API

Brief Introduction

Please refer to the following for the SDK description:

Android openSDK download (version >=5.3.1)：Android resources

Android SDK guidelines：openSDK guidelines

iOS openSDK download (version >=1.8.4)：iOS resources

iOS SDK guidelines：openSDK guidelines

API Used：WXOpenBusinessView?

Interface compatibility：

● Compatibility with iOS: For Weixin version 7.0.3 or above, the developer can initiate Weixin mini-programs through this openSDK interface; for Weixin version below 7.0.3, the developer can jump to Weixin through this openSDK interface, but cannot initiate Weixin mini-programs. In this case, Weixin will prompt the user that the application request is invalid or the Weixin version is too low.

● Compatibility with Android: For Weixin version 7.0.3 or above, the developer can initiate Weixin mini-programs through this openSDK interface; for Weixin version below 7.0.3, the developer can neither jump to Weixin nor initiate Weixin mini-programs through this openSDK interface. In this case, the developer needs to prompt the user to update the Weixin.

Request Parameters

Example：

WXOpenBusinessViewReq *req = [WXOpenBusinessViewReq object];
req.businessType = @"wxpayOverseaEntrustAuthorization"; // Fixed value
req.query = @"sessionId=20211115171992080208"; // The session ID got from pre-sign response
req.extInfo = @"{\"miniProgramType\":0}"; // Fixed value
[WXApi sendReq:req];

// Sign
int wxSdkVersion = api.getWXAppSupportAPI();
if (wxSdkVersion >= Build.OPEN_BUSINESS_VIEW_SDK_INT) {
WXOpenBusinessView.Req req = new WXOpenBusinessView.Req();
req.businessType = "wxpayOverseaEntrustAuthorization"; // Fixed value
String SesssionId = "20211115171992080208"; // The session ID got from pre-sign response
req.query = "sessionId=" + SesssionId; // Configure parameter
req.extInfo = "{\"miniProgramType\": 0}"; // Fixed value
Boolean ret = api.sendReq(req);
} else {
// Consumer need to update the WeChat version to complete signing
}
 

/******** Sample code for receiving signing success notification by onResp of WXEntryActivity*******/
@Override
public void onResp(BaseResp r) {
if (r.getType() == ConstantsAPI.COMMAND_OPEN_BUSINESS_VIEW) {
WXOpenBusinessView.Resp launchMiniProgramResp = (WXOpenBusinessView.Resp) r;
String text = String.format("nextMsg=%snerrStr=%snbusinessType=%s",
resp.extMsg, resp.errStr, resp.businessType);
Toast.makeText(this, text, Toast.LENGTH_lONG).show();}
}