const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({assigned_clinician_id: 123})
};
fetch('https://jaliprohmis.derrickmugabwa.dev/api/v1/appointments/{appointment}/assign-clinician', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));