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();}
}