// business microservice address
  const qsBusi = "http://localhost:8081/api/busi_saga"
  req := &gin.H{"amount": 30} // Microservice payload
  // The address where DtmServer serves DTM, which is a url
  DtmServer := "http://localhost:8080/api/dtmsvr"
  saga := dtmcli.NewSaga(DtmServer, dtmcli.MustGenGid(DtmServer)).
    // Add a TransOut sub-transaction, the operation is url: qsBusi+"/TransOut"，
    // compensation operation is url: qsBusi+"/TransOutCompensate"
    Add(qsBusi+"/TransOut", qsBusi+"/TransOutCompensate", req).
    // Add a TransIn sub-transaction, the operation is url: qsBusi+"/TransOut"，
    // compensation operation is url: qsBusi+"/TransInCompensate"
    Add(qsBusi+"/TransIn", qsBusi+"/TransInCompensate", req)
  // Submit the saga transaction, dtm will complete all sub-transactions/rollback all sub-transactions
  err := saga.Submit()