Two-Way Sync Between Your CRM and a System That Cannot Send Webhooks

Teams often run two systems that both hold the same customer, where one is the system of record for the work and the other is the system of record for the relationship. Neither vendor offers a real integration, so staff retype every customer by hand into the second system, which produces duplicate records, missed updates, and a CRM nobody trusts because it is always slightly out of date.

1. When a record is created in the operational system, in this build the ARIVE loan origination platform, the matching customer is created in HubSpot automatically, with related contacts attached and the correct team member assigned as owner.

2. When a deal is moved to an agreed trigger stage in HubSpot, the corresponding record is created in the operational system under the same owner, so the sync runs in both directions rather than one.

3. Ownership rules are applied on creation in both directions, so a record always lands with the right person instead of arriving unassigned and waiting for someone to notice.

4. Permissions lock deals to the team member who owns them, so each person sees only their own pipeline while an administrator sees everything.

5. Contact records stay shared across the team even though deals are restricted, which is what stops two people creating duplicate customer records for the same person.

6. Because the operational system cannot announce when a record is edited, the workflow stores a copy of every record each day and compares today's copy against yesterday's.

7. Any field that differs between the two copies is synced across, which means edits made directly in the operational system are picked up even though it never sends a notification.

Nobody retypes a customer in either direction, and edits made in the system that cannot report changes still reach the CRM. Each team member works in their own lane with their own records while the shared contact list stays clean enough that the CRM can actually be trusted for reporting.

• A HubSpot account is required with API access and with permissions configured, since the ownership model depends on deals being restricted while contacts remain shared.
• The operational system has to expose an API that allows both reading records and creating them, because a one-way integration cannot support this pattern.
• Zapier is used to connect the two systems where a direct integration does not exist.
• A field map has to be agreed before build, covering which system owns which field and what happens when both hold a value.
• Somewhere is needed to store the daily copy of every record, because the change detection works by comparing the current state against the previous day's stored state.
• The trigger stage that starts the reverse sync has to be defined and agreed with the team, since a stage change is what creates a real record in the operational system.

• Edits made in the operational system are detected once per day rather than instantly, so this pattern suits records that move over days and not ones that need real time accuracy.
• Storing and comparing a daily copy of every record consumes API calls and storage that grow with record count, so the approach needs review before it is applied to very large datasets.
• When the same field is edited in both systems between two comparisons, a rule is required to decide which version wins, because the sync cannot infer intent on its own.
• Field mappings are specific to the two systems being connected, so replacing either one means remapping rather than reconfiguring.
• Restricting records by owner limits what each person can see, which means any cross-team reporting has to be done from an administrator view.
• Customer financial information carries handling obligations, and the business running the sync remains responsible for access control, retention, and the privacy rules that apply to it.