Add customer from external application

Is there any way to add a customer/guest to OwnerRez from an external app? I've got a CRM that I collect guest information (name, phone, email) from Facebook lead ads. I'd like to add the potential customer information to OR as when they ask for a quote for a certain date range I will already have their info in OR. 

I've tried Zapier, which my CRM and OwnerRez both have integrations, however the ability to push to OwnerRez is very limited. I just need to create the customer in OR.

I'm currently generating an inquiry via email to do this, which works, but also really clutters up the inquiry list.

Yes, this can be done using our open API:

https://www.ownerrez.com/support/articles/api-overview

https://api.ownerrez.com/help/v2/Api/POST-v2-guests