Developers
A REST API for your receivables that doesn’t fight you.
Sandbox in minutes, production in days. Submit invoices, track collection status via webhooks, and pull clean reconciliation data — with a sandbox that mirrors production 1:1, including arrears scenarios.
Sandbox login
Spin up a free sandbox account with mock invoices, test debtors, and a full set of programmable scenarios — from partial payments to simulated arrears and defaults.
API documentation
Browsable OpenAPI 3.1 reference, code samples in cURL, Node, Python and PHP, plus end-to-end recipes for the most common invoice-submission and collections flows.
What you get from day one.
- REST API to submit invoices and initiate collections, JSON in and out.
- Webhook notifications whenever a collection’s status changes.
- Sandbox test mode to simulate full success and failure flows before going live.
- A clear status lifecycle from initiation through to settlement.
- Descriptive error codes with messages, for fast troubleshooting.
Developer support
Real engineers on a Slack channel, Mon–Fri 09:00–17:00 CET, with on-call coverage for production incidents around the clock.
- Email: support@nexinity.eu
- Status page: sandbox-api.nexinity.eu/status