When systems do not communicate, people become the API: they copy data, check statuses, send files, and manually repair mistakes.
In short: You do not need to replace everything to reduce chaos. Often the first step is defining the source of truth, synchronized data, and error rules between existing systems.
Start with the source of truth
Before APIs, answer the essential question: where is the truth for each type of data?
Examples:
- product and stock may live in the ERP;
- lead and sales history may live in CRM;
- order may start in e-commerce;
- invoice may be generated in another system;
- support status may live in the helpdesk.
If two systems believe they own the same data, integration will create conflicts.
Do not synchronize everything
A good integration does not move all data everywhere. It moves the data required for decisions and operations.
For every field, ask:
- who uses it;
- how often it changes;
- what happens if it is delayed;
- what happens if it is wrong;
- who is allowed to modify it.
Unnecessary data increases cost and risk.
Choose the right mechanism
Integrations can work through:
- direct API for frequent actions and good control;
- webhook for events such as new order or status changed;
- scheduled sync for data that does not need to be instant;
- middleware when rules, transformations, or multiple systems are involved;
- controlled import/export when older systems do not expose stable APIs.
There is no best mechanism in the abstract. There is a mechanism that fits risk, volume, and frequency.
Design for errors
The integration will meet errors. The question is whether you see them and can recover.
You need logs, retry, alerts, an admin screen for exceptions, audit trail for critical actions, and a support procedure.
Without monitoring, an integration looks fine until someone discovers that data has been wrong for days.
Phase the rollout
Do not connect all systems at once. Pick an impactful flow:
- order from e-commerce to ERP;
- order status back to the client;
- invoice generated automatically;
- ticket created when an exception appears;
- dashboard for errors and delays.
Each phase needs acceptance criteria, not just “the integration works”.
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