While it is currently not possible to GET invoice by ID on Freshbooks right now, you can use Workato's HTTP connector to achieve the same goal.
Documentation on Workato's HTTP connector can be found here.
Documentation on Freshbooks Authentication can be found here.
Documentation on Freshbooks GET invoice by ID can be found here.
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Add "Get Invoice by Id" for Freshbooks
It would be very helpful to be able to query the invoice object using the Freshbooks invoice Id. I am working on a Freshbooks payment to Quickbooks payment recipe.
Quickbooks requires the Quickbooks invoice Id to apply a payment correctly. Freshbooks trigger based on new/updated payment gives me the Freshbooks invoice Id. My goal would be to get the invoice details from Freshbooks using that Id so I can get the invoice number. From there, I would query invoice details in Quickbooks to get the QB invoice Id. I could plug that into my payment and I would be done.