const options = {
method: 'PATCH',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify({phone: '<string>'})
};
fetch('https://gp-auth-module.prod.gnosispay.com/phone', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));