Hi @topps,
I hope you are doing well today!
Forminator supports webhooks;
https://wpmudev.com/docs/wpmu-dev-plugins/forminator/#webhook
There are no specific tutorials or explanations available on how to integrate Forminator with Omnisend via a webhook. However, using webhooks on Forminator is straight-forward. You can find an example for Zapier below.
https://wpmudev.com/docs/wpmu-dev-plugins/forminator/#example-setup-with-zapier
Basically create the webhook on client side, activate the webhook integration on Forminator as instructed in above link and match the fields.
You can also go with the Omnisend-Zapier-Forminator integration.
https://support.omnisend.com/en/articles/2440741-integration-with-zapier
Kind regards,
Zafer