The webhooks issued by Coupontools are sent from one of the following IP addresses:

83.217.74.65
83.217.70.74
185.86.16.42

Please note: The IP addresses listed above are used by our worker nodes. The IP addresses of our app servers are changing quite often though. The recommended way is therefore to set up and test your webhook with an open firewall. Once, everything works as expected you can close the firewall to the listed IP addresses.
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