Moneybird API Integration | MG Software

Moneybird is a Dutch cloud accounting platform built for freelancers, consultants and small to medium businesses. It combines invoicing, contact management, time tracking and VAT returns in a single, approachable interface. Because it runs entirely in the cloud, updates happen automatically and users access their administration from any device.

For developers, Moneybird provides a REST API v2 that covers nearly every aspect of an administration. You can create and retrieve contacts, generate invoices and estimates, read general ledger mutations, and manage time tracking entries. The API communicates in JSON and supports both personal access tokens for single-admin scenarios and a full OAuth2 flow for applications that operate across multiple administrations.

Beyond REST endpoints, Moneybird offers webhooks that push events to your application in near real time. When an invoice is marked as paid or a new contact is added, your system receives an HTTP callback with the relevant details. This combination of pull-based querying and push-based events makes it possible to synchronize data in real time or in batches, depending on what suits your operations best.

One important architectural detail is that every API call runs within the scope of a specific administration. Companies that manage multiple administrations, for example a holding company with subsidiaries, must authenticate per administration. This provides strong data isolation, but requires thoughtful design when you need to aggregate information across entities.

Manually retyping invoice data costs time and introduces errors that often surface only during VAT filing or debtor reconciliation. An accountant who spends two hours a week entering sales invoices into Moneybird loses over a hundred productive hours each year. For growing businesses, that overhead becomes unsustainable.

An automated integration moves data directly from your application into Moneybird without intermediate steps. Orders placed in your custom CRM or SaaS platform are converted into draft invoices with the correct VAT rates, payment terms and ledger accounts. This saves data entry work while ensuring your administration stays current at all times.

Integration also improves transparency toward your customers. When a client can view outstanding invoices, check payment status or request a credit note through your portal, the customer experience improves without adding load to your support team. All data is pulled directly from Moneybird, the single source of financial truth.

For service firms that rely on time tracking, the benefits go further. Hours logged in an internal tool automatically become billable line items inside Moneybird. This prevents hours from falling between the cracks during the invoicing cycle and gives project managers faster insight into revenue per engagement.

The integration starts with authentication setup. For applications that only interact with your own administration, a personal access token is sufficient. If you are building a product that serves multiple Moneybird customers, OAuth2 is the appropriate path. In both cases, tokens are stored in environment variables and a secrets manager, never hardcoded in source files.

Next, we model the data flow. For each use case, we map the entities involved (contacts, invoices, products, time entries), the direction of data movement and the required synchronization frequency. For invoice generation from orders, we typically choose an event-driven approach: when an order is finalized, your application publishes an event that a worker picks up and translates into a Moneybird API call.

Moneybird webhooks are routed to a secured endpoint in your infrastructure. Each webhook payload includes an event type and administration ID, enabling server-side routing and filtering. Because Moneybird does not guarantee retries on all event types, we also build a polling job that periodically fetches recently modified entities and compares them to local state.

Error handling is critical. The Moneybird API returns clear HTTP status codes and JSON error messages. We log every failed call, classify errors by type (validation, rate limit, server error) and implement targeted retry strategies. Validation errors are surfaced immediately on an operator dashboard; rate limit errors are retried with exponential backoff.

Finally, we document every endpoint, every field mapping and every business rule in an integration contract. That document serves as the single source of truth for both developers and finance, making future changes fast and safe.

Moneybird tokens grant access to financial data, so secure storage is non-negotiable. We store tokens exclusively in a secrets manager such as HashiCorp Vault, AWS Secrets Manager or the secret store of your hosting platform. Tokens are never logged, never committed to version control and never exposed in error responses.

The API communicates exclusively over HTTPS/TLS, which prevents man-in-the-middle attacks. We validate incoming webhooks based on the administration ID and, where available, a shared secret, so only legitimate payloads are processed. Unknown sources are rejected and logged for review.

For organizations with multiple administrations, each token only grants access to the administration it was issued for. A leak in one subsidiary does not automatically expose the parent company. We recommend creating separate credentials per administration and rotating them on a regular schedule.

Dutch VAT rules are a frequent source of complexity. Domestic deliveries, intra-community supplies and exports outside the EU each carry different rates and reporting obligations. Your integration must select the correct rate based on customer location and delivery type. We build a rule engine that centralizes this logic, so rate changes can be applied in a single place.

Ledger account mapping is another common hurdle. Moneybird provides a default chart of accounts, but many businesses customize it. Every revenue line, expense entry or VAT booking must land on the right account. We solve this with a configurable mapping table that finance can manage without code changes.

Finally, businesses with multiple administrations sometimes struggle with reporting aggregation. Moneybird treats each administration as a closed unit. If you need a consolidated view, your application must fetch and merge data from several administrations. We build a consolidation layer that synchronizes per administration and then presents a unified view in your own tooling.

After go-live we continuously monitor API responses for unexpected status codes and increased latency. A daily health check verifies that tokens remain valid and webhook endpoints are reachable. When Moneybird changes API versions or deprecates endpoints, we pick up signals from their changelog and adapt the integration proactively.

For ongoing support we offer a maintenance contract that covers bug fixes, minor adjustments and version upgrades within agreed SLA windows. This keeps your integration reliable without requiring your team to track Moneybird documentation changes.

The investment for a Moneybird integration depends on the number of entities, the complexity of VAT logic and whether multiple administrations are involved. A basic flow, such as automatic invoice creation from orders, typically fits within a two to three week sprint.

More complex scenarios, like bidirectional sync with time tracking, consolidation across multiple administrations or a customer portal with real-time debtor visibility, require additional design and testing effort. We work with fixed sprint budgets and deliver working software after each sprint, so you can steer along the way.

Request a free scoping session. During that conversation we map out your situation and provide a realistic estimate of timeline and investment.