Error on Post request for Create Achievement Localization

Hi,

I am using Node.js for updating my game achievements. Also not sure what is the recommended programming language to use for this.

I will want to add Achievement Localization to my existing achievement.

I was following the document here: https://developer.apple.com/documentation/appstoreconnectapi/post-v1-gamecenterachievementlocalizations

const postData = {
	type: "gameCenterAchievementLocalizations",
	attributes: {
		locale: "it-IT",
		name: "XXXXXXXXXXX",
		afterEarnedDescription: "XXXXXXXXXXXXXX",
		beforeEarnedDescription: "XXXXXXXXXXXXXXXXXXXXXXXX"
	},
	relationships: {
		gameCenterAchievement: {
			data: {
				type: "gameCenterAchievement",
				id: "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
			}
		}
	}
};

let axiosConfig = {
	headers:{
	Authorization: `Bearer ${token}` }
};

const response = axios.post('https://api.appstoreconnect.apple.com/v1/gameCenterAchievementLocalizations', postData, axiosConfig);

After I run the above code, it throw me an error 422.

status: '422',
          code: 'ENTITY_UNPROCESSABLE',
          title: 'The request entity is not a valid request document object',
          detail: "Unexpected or invalid value at 'type'.",
          meta: { position: [Object] }

Any idea what went wrong with my code?

Thank you