code: function postJson({ url, payload, contentType, useBearer }) {
    return ajax({
      url,
      method: 'post',
      body: JSON.stringify( payload || {} ),
      contentType,
      useBearer
    })
  }
docs: Post JSON data.
  
  @param {string} url - The URL to make the request to.
  @param {object} payload - Data to be sent with the request.
  @param {string} contentType - The content type of the request. Defaults to "application/json".
  @param {boolean} useBearer - Flag indicating whether to include bearer authorization.