The realm_id is a QuickBooks-specific property.
We store this on a specific settings field for the QuickBooks connection when it's returned from QuickBooks.
The setting can be accessed via the API directly and used on the Proxy API as a variable in the URL for unsupported endpoints. e.g., https://quickbooks.api.intuit.com/v3/company/{realm_id}/...
Example case for fetching all the customers for a certain QuickBooks client with the realm_id .
The x-apideck-downstream-url for a Proxy API request would look like this:
https://sandbox-quickbooks.api.intuit.com/v3/company/{realm_id}/query?minorversion=63&query=select * from Customer
The {realm_id} is a setting managed in Vault and automatically injected when executing a Proxy request.
