Trying to form Fetch post based on a curl example

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Thanks for looking…

Seems like a pretty common task but there isn’t much on the Post side for working examples floating about.

I’m not sure if my header is malformed or if I am doing something else basic wrong here.
working from the API Example for POST https://www.wix.com/corvid/reference/wix-fetch.html

I am seeing a warning:
"["Unhandled rejection TypeError: (intermediate value).catch is not a function

//Freshsales Example Account Post
curl -H "Authorization: Token token=sfg999666t673t7t82" -H "Content-Type: application/json" //-d '{"sales_account":{"name":"Widgetz.io (sample)"} }' -X POST "https://domain.freshsales.io/api/sales_accounts"

data.js

function updateFreshSales(item, context)
{
 console.log('function updateFreshSales' );

 const salesURL = 'https://domain.freshsales.io/api/sales_accounts';

 // The data we are going to send in our request
 let data = {
    sales_account : {
      name:  item.companyName
    }
  };
  JSON.stringify(data);

 // The parameters we are going pass to the fetch function
  fetch( salesURL, {
 "method" : "post",
 "headers": {
 "Authorization": "Token token=N-dOp-iQLtl0JvwHTO67Sg",
 "Content-Type": "application/json"
      },
 "body": data
  })
  .then( (httpResponse) => {
 if (httpResponse.ok) {
 return httpResponse.json();
    } else {
 return Promise.reject("Fetch did not succeed");
    }
  } )
  .then( (json) => console.log(json.someKey) )
  .catch(err => console.log(err))
}  

export function partnerRequests_afterInsert(item, context) {

  sendEmail(item, context);
  updateFreshSales(item, context); 

}