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**Requirements:** Admin role; the API key from section 3.

1. In **Integrations**, find the **Brevo** card (in "Available" state) and click **Connect**.
2. The "Connect Brevo" modal repeats the help from section 3, so you have it at hand without going back to Brevo.
3. Paste the **API key (v3)** into the field.
4. Click **Connect**.

**Result:** the Platform **verifies the key against Brevo for real** before saving anything — it doesn't accept a key with a valid format and nothing more. If verification fails, you're told the specific error (section 8) and no credential is saved. If it succeeds, the card switches to **Connected**.

![“Connect Brevo” modal with the instruction to create the key under Account → SMTP & API → API Keys in Brevo, the notice not to use the MCP server key, the note about the verified sender or authenticated domain, the API Key field, and the Cancel and Connect buttons](/captures/int-brevo-connect-modal.png)