CORS error while posting to Doppler API

I'm trying to add a subscriber to a Doppler's list using its API but it keeps throwing a CORS error over and over again:

CORS Header 'Access-Control-Allow-Origin' is missing


The way a post the data is the next:

let options =
method: 'POST',
url: `https://restapi.fromdoppler.com/accounts/$this.dopplerEmail/lists/$this.dopplerNewsletterId/subscribers`,
params:
"email": this.email,
"fields": [

"name": "FIRSTNAME",
"value": this.name,
"predefined": true,
"private": true,
"readonly": true,
"type": "string"
,

"name": "BIRTHDAY",
"value": this.birthday,
"predefined": true,
"private": false,
"readonly": false,
"type": "date"
,

"name": "CONSENT",
"value": "True",
"predefined": true,
"private": false,
"readonly": false,
"type": "consent"

]
,
headers:
'Authorization': `token $this.dopplerApiKey`,



axios(options).then(r =>
... some logic
).catch(e =>
console.log(e)
);


All my variables are okay so I think the problem is inside my post settings but i can't figure out what is it.

I am using Laravel 5.6 and this whole logic (including the form itself) is inside a VueJS component.

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