Integration with integromat and zapier
Now there is an old connection to zapier (https://zapier.com/apps/whmcs/integrations) with only one trigger (new todo item) and there is no formal connection to integromat.
There is also an old feature request about adding more functionality to the zapier app with 19 votes:
In general we need to have any existing hook and API option available to be added as a trigger to integromat and zapier and also to get data from integromat and zapier in to WHMCS.
In the old feature request I mentioned before there are several examples for such a connection. But if needed I can add some more.