Can Dynamics 365 Marketing Forms Be Submitted Directly from a Backend Service?

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Posted on by CU08051227-0

Hello,

I’m working with Dynamics 365 Customer Insights / Marketing forms and noticed the embedded forms submit to a public endpoint like:

https://<org>.dynamics.com/api/v1.0/orgs/<orgid>/landingpageforms/forms/<formid>
From the browser network traffic, it appears the form is submitted directly via JavaScript.

Is it officially supported to submit these forms from a pure backend process (server-side integration, middleware, ETL job, webhook, etc.) without rendering the webpage/UI?

Example:
await fetch(formApiUrl, { method: "POST", headers: { "Content-Type": "application/json" }, body: JSON.stringify({ firstname: "John", email: "john@example.com" }) });

Or are these endpoints intended only for browser-based submissions with frontend validation/session handling?
If unsupported, what is the recommended Microsoft approach for backend form submission?

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Dynamics 365 Customer Insights - Journeys

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ManoVerse 1,149 Super User 2026 Season 1 on at

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No, it is not supported to submit forms directly from a backend by POSTing to the landingpageforms/forms/{formid} endpoint. This endpoint is not a public API and is designed only for browser-based submissions using Microsoft’s embedded form JavaScript. It relies on frontend-specific capabilities such as validation, consent and double opt‑in handling, anti‑bot protection, cookies, and session context.
Calling this endpoint from server-side code or custom JavaScript (even from a custom page) is unsupported, not officially documented, and not future‑proof. It may block or change this behavior at any time. For backend, ETL, or middleware integrations, the Dataverse Web API is the supported approach for creating Leads or Contacts and managing consent logic.

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