promise.js

actions : {
  createTourney (context, payload) {
    return new Promise (resolve, reject) {
      // prepare data to be sent
      axios({
        // mthod,url, data....
        validateStatus: function (status) {
          return (status >= 200 && status < 300) || (status === 400)
        }
      }).then(response => {
        if (response.status === 400) {
          resolve(response)          
        } else {
          //store commits
        }
      }).catch(error => {
        console.log(error)
      })
    }
  }
}