docs: function sendText (recipient, text) {
    return new Promise (async (resolve, reject) => {
      if (!text) {
        reject('text required');
      }
      
      let payload = {'text': text};
  
      try {
        let response = await this.callSendApi(recipient, payload);  
        resolve(response);
      } catch (e) {
        reject(e);
      }
    });
  }