Which IP addresses does Mollie use?

The Mollie API uses webhooks to push updates to your integration.

A common way to ensure the authenticity of webhooks, is by validating whether the IP address that sent the request is a known IP address.

For the Mollie API, we recommend against this practice. As our systems continue to evolve, the IP addresses used by our webhook systems will likely change over time. If you have a fixed list of allowed IP addresses on your end, this means that sooner or later you will start missing out on our webhooks.

Instead, the Mollie API will always only send you an ID of the entity that got updated. You will need to retrieve the full entity to understand what changed, and by doing so you are ensuring your information comes directly from an authenticated Mollie API call.