> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://developers.brevo.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://developers.brevo.com/_mcp/server.

# New parameters ext_id in Create and Update a Contact routes

**Route:** [Create a contact](\[https://developers.sendinblue.com/reference/createcontact]\(https://developers.sendinblue.com/reference/createcontact\))\
**Route:** [Update a contact](\[https://developers.sendinblue.com/reference/updatecontact]\(https://developers.sendinblue.com/reference/updatecontact\))\
**Route:** [Update multiple contacts](\[https://developers.sendinblue.com/reference/updatebatchcontacts]\(https://developers.sendinblue.com/reference/updatebatchcontacts\))\
ext_id parameter added in Create a contact, Update a contact and Update contacts in a batch API.