Developers
API documentation
Build on top of Marchant. The REST API is coming soon for contacts, invoices and expenses, with webhooks that push events to you without polling. Register your interest below.
Full API docs are on their way
We're preparing comprehensive API documentation including authentication guides, endpoint references and code examples in JavaScript, Python and PHP. Register your interest to be notified when they're ready.
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What the API covers
The API is coming soon. Contacts, invoices, expenses and webhooks come first; the rest is on the roadmap.
Invoices
Create and retrieve invoices programmatically.
Expenses
Submit expenses and query categorised spend.
Banking & Transactions (roadmap)
Read bank transactions, balances and reconciliation status.
Reports & Analytics (roadmap)
Pull P&L, VAT summaries and cash flow data into your own dashboards.
Tax Filings (roadmap)
Query MTD submission status for your clients; TVA and ELSTER planned for 2028.
Contacts & Clients
Manage your client and supplier directory via API.
Webhooks (roadmap)
Subscribe to invoice, payment, contact, expense and bank-transaction events. Signed payloads, no polling.
API access will be included in Premium
The REST API is coming soon, and when it ships it will be part of the Premium plan. Register your interest and we will tell you the day API tokens can be generated.