Connecting a CRM, ERP and other applications can reduce repeated data entry, but the connection needs clear rules. Before choosing an integration tool, decide what information moves, in which direction and which system is allowed to change it. “Keep everything synchronized” is not a sufficient specification.
Pick one complete business flow
Consider an accepted sales order that should become a fulfilment task. List the trigger, required fields, destination and person responsible if the transfer fails. Confirm whether cancelled or edited orders must also be sent.
Start with this flow rather than every object in both applications. A small integration can reveal the real constraints before the team commits to a wider rollout.
Assign an owner to each shared field
A sales application may own the customer contact details while another system owns delivery status. Write down those responsibilities. If both systems can edit the same field, define how a conflict is resolved and how staff can see it.
Map identifiers explicitly. The customer’s display name is usually not a reliable technical key. Preserve a relationship between source and destination IDs so updates affect the intended record instead of creating a new copy each time.
Check the supported connection options
Ask each vendor about APIs, event notifications, file import and export, authentication, rate limits and access costs. Having an API does not mean every operation your project needs is available.
A scheduled transfer may be enough when the process does not require immediate updates. If a standard connector fits the flow, evaluate it before commissioning a custom one. Include the ongoing subscription, permissions and failure handling in the comparison.
Make retries safe
Networks and services fail. Decide what happens if the destination accepts an order but the response never reaches the integration. Retrying blindly can create a second order.
Use stable references and a record of processed actions so repeated delivery can be recognized. Test duplicates, partial failure, unavailable services and changes arriving out of order. Provide staff with an exception list and a controlled way to retry or correct a failed item.
Limit what the connection can access
Use a dedicated account with only the permissions needed. Check access to individual records, not only whether the request has a valid login. OWASP describes missing object-level authorization as an API security risk.
Do not copy credentials into frontend code or ordinary support messages. Agree who rotates access keys, reviews permissions and disables the connection when it is no longer needed.
What should you receive at handover?
Request a field map, ownership rules, update schedule, error alerts, test results and an operating guide. Name the person who watches failures and confirm what maintenance covers when a vendor changes its interface.
Diloxy’s custom software service can extend existing applications and build integrations. If the goal is reporting rather than changing records, our data collection guide describes a simpler read-only starting point.