[Vuejs]-Why parameter returns 'undefined' when using Vuetify

According to the example here it appears you should be using the ePayco.token.create() function a bit differently.

epayco.token.create(paymentDetails)
.then(function(token) {
    console.log(token);
})
.catch(function(err) {
    console.log("err: " + err);
});