const url = 'https://api.sureshake.com/v2/notifications/push-tokens';
const options = {
method: 'POST',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify({expoPushToken: 'string', platform: 'ios', deviceId: 'string', appId: 'string'})
};
fetch(url, options)
.then(res => res.json())
.then(json => console.log(json))
.catch(err => console.error(err));