Software development • Montreal

API Development and Integration in Montreal

Most Montreal businesses run on five or six separate tools: accounting, CRM, payment processor, website and a few spreadsheets. None of them talk to each other, so someone retypes invoices, exports CSV files and chases numbers that never match. API development and integration fixes that. We build the connections and custom endpoints that let your systems exchange data on their own.

DaniMaster is a Montreal software team that builds and runs its own integrated products, so we know what breaks in production. We connect ERPs, payment platforms, databases and web apps for small and mid-size Canadian businesses.

What we build

API work covers more ground than most people expect. Here is what we build.

• Custom REST and JSON APIs for your own products, with authentication, rate limits and documentation
• Third-party integrations: Stripe, PayPal, Supabase, Cloudflare, Google Workspace, mail servers, shipping and accounting tools
• ERP software development with Odoo and ERPNext: configuration, custom modules and API connections so sales, invoices, leads and partners flow into one ledger
• Database development: schema design, migrations, reporting views and performance tuning on PostgreSQL, MariaDB and SQLite
• Webhook handlers that react to events such as a paid invoice or a failed payment
• Scheduled sync jobs that reconcile records between two systems and flag mismatches
• Legacy connectors for older software that only exports files

We work in PHP, Node.js, TypeScript and Python, and we pick the language that fits your existing stack. Every integration ships with logging, retry logic and an alert when something stops working.

How we work

Integration projects fail when nobody maps the data first.

1. Discovery. We list every system involved, who owns it, what data lives where and which record is the source of truth. 2. Design. We write a short integration spec: field mappings, sync direction, frequency, error handling and duplicates. You approve it before we write code. 3. Build. We develop against sandbox accounts and test databases, never against live data. 4. Test. We run real scenarios: a refund, a partial payment, a client with two addresses, a record deleted on one side. 5. Launch. We migrate in stages, often running old and new processes side by side for a week, then cut over. 6. Support. We monitor logs and webhooks after launch and fix what live data reveals. Most clients keep a small monthly agreement so the integration stays current when a vendor changes its API.

You get one point of contact throughout.

Proof: integrations that run our own businesses

We do not just build integrations for clients. We depend on them to run our own businesses.

Our brands share central ledgers in Odoo 17 and ERPNext. Every sale, invoice, lead and partner record from our products lands in those systems through their APIs, tagged by brand, so accounting and CRM happen in one place.

BizLocal, our Quebec and Canada business directory with about 49,000 listings, syncs partner accounts and quote requests to Odoo CRM, and partner billing with referral fees runs from that data.

FacilInvoice, our bilingual invoicing SaaS, runs Stripe subscriptions, a Canadian multi-province tax engine for GST, HST, QST and PST, and card, PayPal, bank transfer and Interac e-Transfer payments on public invoice pages. It matches e-Transfer notifications from a per-business forwarding inbox to invoices after checking their authenticity.

We also connect Supabase, Cloudflare, Postfix mail and Google services. When we recommend an approach, we have run it ourselves.

What it costs and how long it takes

Pricing depends on scope, mainly how many systems are involved and how messy the data is. Typical ranges in Canadian dollars:

• Single integration between two established platforms, for example Stripe to your accounting system: $3,000 to $8,000, one to three weeks
• Custom API for your own product, with authentication and documentation: $8,000 to $25,000, three to eight weeks
• ERP implementation with Odoo or ERPNext, including data migration and two or three connected systems: $15,000 to $60,000, six to sixteen weeks
• Database design or rebuild with reporting: $5,000 to $20,000, two to six weeks
• Ongoing support and monitoring: $300 to $1,500 per month depending on the number of connections

Legacy systems, poor vendor documentation and large migrations push costs toward the upper end. Clean data and modern APIs pull them down. We quote a fixed price after discovery, and we tell you when an off-the-shelf connector will do the job instead of custom code.

Why a Montreal integration partner

You can hire an integration developer anywhere. Here is why a Montreal team is the practical choice for a Quebec or Canadian business.

Bilingual delivery. We work in French and English, write documentation in both and build interfaces that respect your language requirements.

Law 25 compliance. Quebec's privacy law sets rules on consent, disclosure of where data is stored and breach response. Integrations move personal data between systems, so they must be designed with these obligations in mind.

Canadian hosting. On request, we deploy on Canadian data centres so your client records stay in the country. For ERP systems this is often a hard requirement.

Same time zone. When a payment webhook fails at 9 a.m. Eastern, we are already at work.

Local accountability. We are a Montreal company with public products you can inspect. You can meet us, and we build the same integrations for ourselves that we build for you.

Who this is for

API and integration work makes sense in a few recurring situations.

• A growing service business. Your bookkeeper spends hours each month re-entering Stripe or Square payments into QuickBooks or Odoo. A two-way sync removes that work.
• A distributor or wholesaler. Orders arrive by email and web form, inventory lives in one system and invoicing in another. A central ERP with API connections gives you one view of stock, orders and receivables.
• A SaaS founder. Your product needs a public API so customers and partners can build on it, documented and secured.
• A clinic, firm or association. Client records sit in a legacy database. We design a new schema, migrate the data safely and connect it to your modern tools.

If one of these sounds like your Montreal business, we can scope it quickly. Start with a free 30-minute call. We will send a written estimate within days.

Frequently asked questions

Do we need to replace our current software to integrate it?

Usually not. Most modern tools expose an API or at least an export. We connect what you already use and only recommend replacing a system when it has no way to share data or when its licence costs more than a better option.

What happens when Stripe, Odoo or another vendor changes its API?

Vendors announce changes in advance, and our integrations log every call, so breaking changes show up quickly. Clients on a support agreement get updates included; others receive a quote for the fix. We build on versioned endpoints wherever the vendor offers them, which limits disruption.

Should we choose Odoo or ERPNext?

Both are open-source ERPs with strong APIs, and we run both. Odoo has a larger app ecosystem and a polished interface, with paid editions for advanced modules. ERPNext is fully open source with no per-user licence. We recommend based on your modules, team size and Quebec accounting needs.

How do you keep our data secure during an integration?

We use scoped API keys with minimum permissions, store secrets in encrypted configuration rather than code, encrypt data in transit and log access. Development happens against sandbox accounts and test data, not production. Under Law 25 we also document what personal data moves where, so you can answer client questions.