WXOpenBusinessViewReq *req = [WXOpenBusinessViewReq object];
req.businessType = @"wxpayOverseaEntrustAuthorization"; // 固定值
req.query = @"sessionId=20211115171992080208"; // 20211115171992080208為預(yù)簽約會(huì)話(huà)ID
req.extInfo = @"{\"miniProgramType\":0}"; // 固定值
[WXApi sendReq:req];

// 發(fā)起簽約
int wxSdkVersion = api.getWXAppSupportAPI();
if (wxSdkVersion >= Build.OPEN_BUSINESS_VIEW_SDK_INT) {
WXOpenBusinessView.Req req = new WXOpenBusinessView.Req();
req.businessType = "wxpayOverseaEntrustAuthorization"; // 固定值
String SesssionId = "20211115171992080208"; // 預(yù)簽約會(huì)話(huà)ID，通過(guò)下述預(yù)簽約API獲取
req.query = "sessionId=" + SesssionId; // 拼接參數(shù)
req.extInfo = "{\"miniProgramType\": 0}"; // 固定值
Boolean ret = api.sendReq(req);
} else {
// 微信版本太低，在這里提示用戶(hù)升級(jí)后再完成簽約
}

/********在WXEntryActivity的onResp里面接收簽約結(jié)束回調(diào)，示例代碼*******/
@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();
// 對(duì)應(yīng)時(shí)序圖步驟3.4 - 3.6，調(diào)用查詢(xún)簽約API獲取協(xié)議最新?tīng)顟B(tài)，然后更新商戶(hù)側(cè)簽約狀態(tài)
}
}