Squarespace–Brevo Signup Integration

I’m using a custom signup form on my Squarespace site that captures a visitor’s email address only, and I need that form to feed directly into a single mailing list in my Brevo (Sendinblue) account. Nothing fancy—no branching logic, no extra fields, just a clean hand-off so every submission lands in the correct list instantly.

You’re welcome to approach this with the Brevo API, a Squarespace code injection, or a lightweight intermediary like Zapier—whatever achieves a reliable, real-time connection without slowing down page load. Once the link is live, I’ll test the form myself; if each new email shows up in the chosen Brevo list, the job is done.

Please let me know what access you’ll need from my Squarespace and Brevo dashboards and how long you expect the setup and verification to take.