API Endpoint structure:
Vecticum API URL: https://app.vecticum.com/api/v1/
Endpoint: it's an ID of Object type or class in Vecticum.
For example, there is a class called "Service invoice" with ID "Rsk9Jv9bV7bGBFupWlE3", so full endpoint URL to service invoices will be:
https://app.vecticum.com/api/v1/Rsk9Jv9bV7bGBFupWlE3
Finally, filters must be used to get list of documents.
About filters - next section Filtering the data