HeyReach, Expandi, Dripify, and Waalaxy all document ways to connect another system to their outreach workflows. They do not expose the same controls. HeyReach documents campaign creation and updates; Expandi documents campaign-level reversed webhooks for adding, pausing, and resuming leads; Dripify documents lead reads and uploads even though its API introduction calls the interface read-only; Waalaxy documents prospect import and campaign lookup. If your CRM must stop a follow-up after a reply, the useful question is which exact operation or event makes that possible, and how you will verify the resulting state.
Separate reads, writes, and events
An API key may let a CRM read a lead without letting it change a running campaign. A webhook may tell the CRM that something happened without providing a way to act on it. Start with three columns: the object your system can read, the change it can write, and the event it can receive. Put the exact vendor operation or event name in each cell. Leave an undocumented cell blank rather than treating “API available” as an answer.
HeyReach's April 2026 Campaign API page documents creating a campaign in draft status, changing its settings, sequence, senders, and schedule, and reading its sequence. Its separate webhook guide describes outbound event delivery. Expandi calls its reversed webhooks the closest publicly available API and documents adding a person to a campaign and pausing or resuming a campaign contact. Its event guide describes outgoing webhook triggers. These are different integration shapes, even though both vendors use the words API and webhook.
Waalaxy's developer introduction shows bearer-key requests to list prospect lists and campaigns, then import prospects with POST /prospects/addProspectFromIntegration. That is evidence for an import workflow. It is not evidence that a buyer can edit a live sequence through the same interface.
Sources: HeyReach Campaign API, HeyReach webhook setup, Expandi reversed webhooks, Expandi webhook events, Waalaxy developer introduction
A successful API write may change campaign state
The state after a request matters more than the HTTP success banner. HeyReach says its campaign Create operation makes a draft; a separate StartCampaign call is needed to activate it. Its UpdateSettings documentation says a scheduled campaign returns to draft after that update, and active or completed campaigns cannot use the operation. A CRM that assumes “settings saved” also means “still scheduled” could leave work idle. Read the campaign status back after the change and have an owner approve any restart.
Dripify's public API introduction describes a read-only API, yet the same live reference documents POST /v1/open-api/campaigns/{id}/leads, POST to append to an existing lead list, and PUT to set a lead's custom field. Its upload documentation says the new list starts collecting only once the campaign is active; enabling a campaign is outside the public API in v1. This is a documentation inconsistency, not proof that a particular account can write. The reference also lists 403 when a subscription excludes Open API access. Ask for a test key on the intended plan and verify one harmless write and readback before treating the operation as purchased capability.
Sources: HeyReach Campaign API, Dripify public API reference
A webhook needs a recovery path
A reply event can arrive after your CRM has changed the same record, or a receiving service can be unavailable. Decide which system owns the prospect's current status before wiring either side to trigger the next action. Keep a vendor lead or campaign-contact ID next to the CRM ID so a repeated event updates the same person rather than creating another prospect. Reconcile by reading current state when the vendor exposes it; ask the vendor for payload fields, delivery retries, event ordering, and a way to recover missed events when its public guide does not answer those questions.
Expandi's pause and resume instructions depend on a campaign-contact ID found in webhook history for an active campaign. A profile URL alone is not the documented input for that action. HeyReach's webhook setup lets an operator choose campaigns and events, so a test must include an event from the exact campaign that will run. Dripify's integration help describes event-triggered webhooks, but its public documentation does not establish the payload and retry behavior for your account. Inspect a real sample before building reply classification or an automatic stop rule around it.
Sources: Expandi reversed webhooks, HeyReach webhook setup, Dripify integration guide
Run a state-change drill before choosing
Use consented test records and an inactive or otherwise controlled campaign. Write down the expected state at each boundary: before import, after import, after a simulated reply, and after a pause. Then read the vendor record and CRM record back. A request receipt establishes only that the API accepted a request; it does not establish that LinkedIn performed an action or that another system received an event. This drill is a proposed buyer test, not a claim that these four products passed it.
- Import one new prospect and one duplicate. Save the vendor IDs and verify which records were created or rejected.
- Change one allowed field or campaign setting. Read the campaign and prospect status back, including whether a scheduled campaign became a draft.
- Trigger one event in the test workflow. Check its campaign scope, identifier, payload, and what the receiver records when the same event is delivered twice.
- Record a reply, then pause the affected prospect. Confirm the queued follow-up state in the vendor UI and CRM; do not infer a stop from a webhook notification alone.
- Disconnect the test receiver briefly, restore it, and ask how missed events are recovered. If the vendor cannot demonstrate a recovery path, keep the handoff manual.
Keep the platform-policy decision separate
These are APIs for vendors' products, not permission from LinkedIn to automate an account. LinkedIn's published guidance says it does not allow unauthorized third-party tools that scrape, modify, or automate activity on its website, and warns that affected accounts may be restricted. A documented API endpoint, pacing option, or successful test does not remove that policy exposure.
Shortlist by the operations your workflow needs, confirm plan access in a test account, and preserve a human stop point for any action involving a LinkedIn identity. If the account owner will not accept the policy risk, use LinkedIn's native tools and human-run outreach. For reply ownership and team permissions, the shared-inbox guide covers a different decision; this article covers the integration boundary.