dataverse_lookup_bind.js

const environmentUrl = "https://yourorg.crm.dynamics.com";
const accessToken = "YOUR_ACCESS_TOKEN";
const contactId = "CONTACT_GUID";
const accountId = "ACCOUNT_GUID";

const headers = {
  Authorization: `Bearer ${accessToken}`,
  Accept: "application/json",
  "Content-Type": "application/json",
  "OData-Version": "4.0",
  "OData-MaxVersion": "4.0",
};

async function run() {
  const response = await fetch(`${environmentUrl}/api/data/v9.2/contacts(${contactId})`, {
    method: "PATCH",
    headers,
    body: JSON.stringify({
      "parentcustomerid_account@odata.bind": `/accounts(${accountId})`,
    }),
  });

  if (!response.ok) {
    throw new Error(`Request failed: ${response.status} ${response.statusText}`);
  }

  console.log(`Linked contact ${contactId} to account ${accountId}`);
}

run().catch((error) => {
  console.error(error);
  process.exitCode = 1;
});