CRM and ERP integrations, field by field.

• Choose CRM and ERP integration when both systems stay and must agree.

  Sales and the back office each keep the system that suits them, and the work is making the records they share consistent.

• Choose workflow automation when the records agree but handoffs stall.

  When data already moves and the delay is approvals, reminders or assignments, the rules around the data are what need automating.

• Choose web application development when no platform fits the process.

  When the process needs records and screens that neither the CRM nor the ERP can hold, a custom application is the honest answer.

The system where a field is created and maintained in the normal course of work should own it: the CRM for contact details and sales stages, the ERP for billing terms, invoices and stock. The other system receives that field and does not edit it, which is what stops the two overwriting each other.

Ownership is decided field by field, not system by system. A customer can have contact details owned by the CRM and a credit limit owned by the ERP, and the integration moves each field in one direction. Where both systems genuinely edit a field, a written rule decides which change wins.

A typical split looks like the list below, and it differs between businesses.

• Contact name, email and phone: owned by the CRM.
• Sales stage and deal value: owned by the CRM.
• Billing address and payment terms: owned by the ERP.
• Credit limit and account status: owned by the ERP.
• Invoices and payment status: owned by the ERP, shown in the CRM.
• The external ID linking both records: written once and never edited.

Duplicates are prevented by matching each incoming record against existing ones on a stable key, such as an email address, a company domain or an external ID stored in both systems, before creating anything. When no confident match exists, the record is held for review instead of being created as a new customer.

Platform rules are not enough on their own. A CRM may deduplicate new contacts by email address and new companies by company domain name, yet not deduplicate companies created through its API by domain, so an integration that writes companies has to do its own matching first.

Existing duplicates are cleaned before the first sync, because an integration copies whatever it finds. After launch, the integration stores the ID from the other system on each record, so later updates find the right record without matching again.

CRM and ERP platforms limit how their APIs can be used: some include API access only on certain plans, many cap the requests an integration can make in a period, and requests beyond that cap are refused until a wait has passed. These limits are confirmed for the plan the business holds before an integration is designed.

The limits are set by each vendor, and they change. An ERP may, for example, make data access through its external API available only on certain pricing plans. A platform may also answer requests beyond its service protection limits with a 429 Too Many Requests error and a Retry-After header giving the number of seconds to wait.

An integration designed for those limits batches records, spreads large loads over time, waits as instructed when a limit is reached and resumes where it stopped. Volumes are estimated from real data before launch, so a limit is met in testing rather than on the first busy day.

Customer data is protected by moving only the fields the other system needs, over encrypted connections, through an integration user that holds the minimum permissions required, with credentials kept on the server and personal data kept out of logs. Which personal data may move at all is a legal question the business answers with its adviser.

Access token privileges should be restricted to the minimum required for the use case, and secrets should be rotated regularly so a stolen credential only works for a short time. Both apply to each system in the chain, not only the most sensitive one.

Moving personal data between systems can raise legal questions about purpose, retention and where data is stored. Those are decided by the business with its legal adviser; the integration implements the decisions, and no compliance outcome is promised.

• CRM integrations
• ERP integrations
• Field mapping and data transformation
• Sync rules and conflict handling
• Deduplication logic
• CRM and ERP implementation and configuration

An example of how one customer record moves through a CRM and an ERP, from the first inquiry to a paid invoice, with the system that owns each step named.

• One answer for each field

  Because every shared field has an owner, a change made in the right system reaches the others instead of being overwritten.

• Orders without re-keying

  A won deal creates the customer and the order in the ERP, so the order starts from what sales agreed.

• Sales sees the whole account

  Order, invoice and payment status flow back to the CRM, so account managers can answer customers without asking finance.

• Problems surface early

  Failed records and reconciliation differences reach a person on the day they happen, rather than at month end.

• Website inquiries into the CRM

  Form submissions stored by the website create or update CRM contacts with their source, instead of arriving as emails someone has to copy.

• Won deals into ERP orders

  Closing a deal in the CRM creates the customer and the sales order in the ERP, with products and prices matched.

• Invoice and payment status back to sales

  Invoices raised and payments recorded in the ERP update the account in the CRM, so renewals and collections start from current information.

• Integrations use the APIs, webhooks and connectors each platform documents, and what the plan in place includes is confirmed before the work is scoped.
• Each system gets a dedicated integration user with the minimum permissions needed, never the account of a named employee.
• Records are matched on stable identifiers, such as an external ID stored in both systems, rather than on names that change.
• Changes are processed so a repeated delivery or a retry updates a record once, instead of creating it again.
• Only the fields the other system needs are synced, and personal data is kept out of integration logs.
• Where a CRM or ERP is not yet in place, it can be implemented and configured as part of the engagement, in accounts the business owns.