Mollie

Mollie publishes a plain-text list of outgoing IP addresses used for webhook delivery and related API callbacks. Allowlist these so payment notifications reach endpoints behind firewalls.

Mollie outgoing webhook/API IPs

Official feed

Official plain-text list of Mollie egress addresses for webhooks and callbacks.

https://ip-ranges.mollie.com/ips.txt

Documentation

Mollie Docs - Webhooks