Looking for advice/code samples for Zoho Creator to Zoho books

i've created a Work Order system using Creator. Once the Work Order is complete I want to send the data to Zoho Books so an Invoice can be generated. Bear in mind that Im also using Zoho CRM and have synced "Accounts" to the Zoho Books "Contacts". My goal is to send the invoice to Books in the proper client account.

If there is anyone here who has some code examples on how to obtain the correct contact ID in Books based on the Account ID or Account Name that I have access to via CRM, please share.

Im sadly disappointed with the lack of examples for the integration between Creator and Book and blown away at how simple MOST their apps can communicate with each other, except these 2.