Why the connector layer exists
Banks were not designed to be consumed as APIs. Every partner exposes different endpoints, file formats, authentication schemes, cut-off windows, holiday calendars, and return codes. Without an abstraction, your engineering team spends more time maintaining bank integrations than shipping product.
A connector normalizes all of that. Money movement, balance inquiries, statement retrieval, and webhook events are exposed through a consistent interface, and the messy translation to each bank's native protocol happens under the hood.
What a production connector must handle
Real-world money movement is full of edge cases: partial submissions, network timeouts, delayed acknowledgements, returns that arrive weeks later, and reconciliation gaps between what the bank reports and what your ledger expects. A production-grade connector treats these as first-class citizens rather than afterthoughts.
- Idempotent submission so a retry never double-sends
- Deterministic state machine for every transaction
- Automatic reconciliation against bank statements and network reports
- Exception queues surfaced to operations with context, not just error codes
- Structured webhooks with retries and signature verification
Build vs. buy: the honest math
Teams often plan to build their own connector because the initial happy path looks straightforward. The cost shows up later — in the sixteenth edge case, the third sponsor bank migration, or the weekend an ACH file rejects because of an unnoticed rulebook change. A dedicated connector platform absorbs those changes so your roadmap stays about product, not plumbing.
Frequently asked questions
How is a connector different from a BaaS provider?
BaaS providers give you a sponsor bank relationship and a branded API. A connector can sit in front of one or many BaaS partners and give you a consistent surface even as you add or switch providers.
Can we start with one bank and add more later?
Yes. The connector is designed so adding a second or third partner does not require rewriting your application code.
What happens if a partner has an outage?
The connector exposes health and can route eligible transactions through a fallback partner where available, and clearly queues the rest with operator alerts.