const inputBody = '{
  "params": {
    "numCopies": 2,
    "numHoseAssemblies": 5,
    "labelSize": "A4"
  }
}';
const headers = {
  'Content-Type':'application/json',
  'Accept':'application/json',
  'Authorization':{
  "type": "string"
}
};

fetch('https://goldleaf.app/api/v1/workorder/{workOrderId}/labels',
{
  method: 'POST',
  body: inputBody,
  headers: headers
})
.then(function(res) {
    return res.json();
}).then(function(body) {
    console.log(body);
});