A CRM API integration connects selected CRM records and operations to another system through an API. It might create a contact from a website enquiry, show an invoice status to a sales team, or pass a won deal to an operational system. The important decisions are which data moves, which system controls it, and what happens when an update fails. An available API is the access point; the integration supplies the rules for using it. Start with one business workflow, then define the records and behavior it requires. That gives you a basis for deciding whether a ready-made connector is enough or custom development is justified.
Describe the workflow before listing fields
“Connect our CRM” leaves too much open. A more useful requirement is: “When an enquiry is accepted on the website, create or update the right contact and attach the enquiry without overwriting a sales representative's notes.”
| Workflow | Records that may be involved | Decision to make |
|---|---|---|
| Website enquiry to CRM | Contact and enquiry/activity | How to find the correct contact |
| Won deal to operations | Company, deal and order request | What approval triggers the transfer |
| Billing status in CRM | Invoice reference and payment status | Which system owns financial status |
| Support activity in CRM | Ticket reference and activity summary | Which details the sales team needs to see |
These are planning examples, not promises that every CRM exposes the same objects or operations. Check the selected product's API and your account's permissions. For instance, HubSpot's contact API documentation describes its own identifiers and operations; those rules should not be assumed for another CRM.
For the broader distinction between an interface and a working connection, see API vs integration.
Choose the appropriate connection method
Several approaches can meet the same business need, but they do not provide the same capabilities.
| Approach | When to consider it | What to verify |
|---|---|---|
| Native connector | The supported workflow matches your task | Fields, direction, frequency, logs and plan limits |
| Integration platform, or iPaaS | You need to configure workflows across supported applications | Branching rules, error recovery, usage charges and export options |
| Unified API | Your product needs a common interface across several CRM providers | Object coverage, provider-specific features and remaining application logic |
| Custom integration | Existing options leave important requirements unmet | Build scope, maintenance responsibilities and ownership |
A unified API can reduce provider-specific work, but it does not automatically decide your business rules or keep every record synchronized. A custom build gives control over implementation, but your team or supplier still has to maintain it.
Compare the smallest solution that meets the requirements. A standard connector plus a small custom component may be enough; a fully custom system is not automatically the best choice.
Define mapping and ownership
The mapping specification should describe more than field names. Include types, allowed values, empty values, identifiers and the action to take when a record cannot be matched.
Use identifiers deliberately
Keep a relationship between the records' stable IDs where the systems support it. Email can help find a person, but it can change or be shared. Do not silently merge two records just because they use the same address; decide how ambiguous matches are reviewed.
Choose a direction per field
A one-way flow is appropriate when one system owns the value. Editing records in both systems does not automatically require every field to synchronize both ways. You can assign different fields to different systems or deliberately leave some fields unsynchronized.
Decide how conflicts and deletions work
Specify what wins when the same value changes in both places. A “last update wins” rule needs reliable version or time information and may still discard a legitimate change. Deleting a record, removing an association, and archiving it are also different actions. Define them before copying events between systems.
A sample mapping worksheet
For a website-to-CRM enquiry workflow, a planning worksheet could look like this:
| Data | Source of authority | Destination behavior | Exception to handle |
|---|---|---|---|
| Submission ID | Website | Store as an external reference | Same submission arrives again |
| Name and email | Website for this enquiry | Create or match a contact under explicit rules | Several contacts match |
| Enquiry text | Website | Attach a new enquiry/activity | Destination field is too short |
| Sales notes | CRM | Leave unchanged | Incoming data includes a similarly named field |
| Processing status | Integration | Record completion or failure | CRM response times out |
Plan the initial import and failure recovery
An initial import and ongoing updates are separate parts of the work. Decide whether history is needed, how records are fetched in batches, and how updates made during the import will be handled.
For production operation, ask who handles each of these situations:
the CRM rejects a field or its format;
credentials expire or permissions change;
a request exceeds the provider's limits;
an update succeeds but the response is lost;
the same event is delivered more than once;
an older update arrives after a newer one;
records stop matching across systems.
Retry only failures that are suitable for retrying, with limits and the provider's timing rules. A timeout does not prove that a write failed. Microsoft's retry guidance explains why repeated non-idempotent operations can cause duplicate effects.
Idempotency means repeated processing does not repeat the intended effect. A key alone is not enough unless the receiving system or your application enforces the behavior. Reconciliation is a separate check that finds missing or inconsistent records and routes them for correction.
If updates arrive through webhooks, the webhook vs API guide explains the delivery model and its limits.
CRM and ERP integration
A CRM-ERP connection applies these same rules to sales and operational data. The following is one possible division of responsibility, not a universal product rule:
| Data | Example authoritative system | What the other system receives |
|---|---|---|
| Sales opportunity | CRM | The approved information needed to create an order |
| Invoice | ERP or billing system | Reference, amount and current status for sales visibility |
| Stock availability | ERP or inventory system | Availability needed by the relevant workflow |
| Customer identity | Defined for your organization | A shared reference linking the records |
Sending an invoice status to the CRM does not make the CRM the accounting system. Likewise, two-way communication between systems does not mean two-way ownership of every field.
An online store adds order, fulfillment and stock workflows. Those belong in ecommerce ERP integration; here the focus is the CRM's role and the rules at the boundary.
Access, handover and ongoing responsibility
Give the integration only the access it needs, protect credentials, and avoid putting unnecessary customer data into logs. Identify who can change the mapping and who investigates failures.
The handover should include the field map, deployment instructions, dependencies, test cases and monitoring responsibilities. API changes and new business rules still need an owner after launch.
For paid custom work at iQyra, project code and the repository transfer to you after payment; reusable iQyra tools are licensed separately. Third-party licenses and subscriptions remain subject to their own terms.
What does CRM integration cost?
We price work at $90 per hour or agree a fixed price for a defined scope. Website package ranges are not minimum prices for standalone CRM integration. A standard connection, a historical import and a custom two-way workflow need separate estimates.
Our API integration cost guide explains the build, maintenance and provider expenses to include. Project-wide terms are on our pricing page.