Yes, Zenvoices provides an API for software developers.
This API offers, among others, the following functionalities:
Execute scan & recognise (automatic recognition of invoices and receipts)
consults a list of administrations
Upload documents to an administration
Retrieve and delete documents
Retrieve bookings
Update the export status of bookings
Manage webhooks
Synchronise master data
Manage custom fields
Retrieve details of a custom field
Manage lookup values
Manage ledger account mappings
Create / modify / delete:
Articles
Purchase orders (including optional ledger account, cost centre and cost unit)
Payment terms
VAT codes
VAT scenarios
Fiscal periods
Ledger accounts
Cost units
Cost centres
Countries
Employees
Projects
Project items
Project phases
Relations (suppliers and customers)
Currencies
Analytical dimensions
Commitments