Set Unsubscribe webhook at Maileon

We need to set up an unsubscribe webhook at Maileon, to sync back the unsubscribed contacts.

Settings:

URL: https://integrations.maileon.com/xsic/ext/msd/public/msd.php

Parameters:

todo (required): unsubscribe

account (required): <the Maileon account ID>

JSON Information:

External ID (required)

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