function toCustomISOString(date) {
  // Ensure input is a Date object
  if (!(date instanceof Date)) throw new Error("Input must be a Date object");
  // Get ISO string, then trim to 3 ms digits and add 'Z'
  return date.toISOString().replace(/\d{3}Z$/, match => match.slice(0, 3) + 'Z');
}


return {
/**
 * 
 * @param  {String} customerId Customer identifier (i.e. 10000050)
 * @param  {[String]} notes  Array on notes
 * @param  {Date} startTime Start time of the interaction
 * @param  {Date} endTime End time of the interaction
 * @param  {String} external URL
 */
  post(customerId, notes, startTime, endTime, url) {
    return new Promise(async (resolve, reject) => {
      try {
        const OIDC = await CAInterface().getOIDC();
        let config = CAInterface().settings().url.CA;
        const contextServiceURL = `https://${config.base}/context-service/${config.tenant}/contexts`;

        const { data } = await CAInterface().axios("contextService", {
          method: "post",
          url: contextServiceURL,
          headers: {
            "Content-Type": "application/ld+json",
            Authorization: `OIDC_id_token ${OIDC.access_token}`,
          },
          data: {
            "@type": "vctx:Context",
            "vctx:contacts": [
              {
                "@type": "vctc:ExternalContact",
                "vctc:subtype": "iva",
                "vctc:direction": "vctc:inbound",
                "vctc:startTime": toCustomISOString(startTime),
                "vctc:endTime": toCustomISOString(endTime),
                "vctc:externalUrl": url,
                "vctc:notes": notes,
              },
            ],
            "vctx:customer": {
              "@type": "vcust:Customer",
              "vcust:identifier": `${customerId}`,
            },
          },
        });
        console.log({
          contextServiceData: data,
        });
        resolve();
      } catch (error) {
        reject(error);
      }
    });
  },
};