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Implementing post connection

Skill merge-api/merge-unified-skills/skills/implementing-post-connection

Claude Code skills for the Merge Unified API

Install
npx -y skills add merge-api/merge-unified-skills --skill implementing-post-connection

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Guide an AI coding agent through the full post-connection experience — settings page, sync status visibility, relinking, integration configuration, custom fields, and category-specific data scope filtering. Use after completing Merge Link setup to build the ongoing integration management experience or settings UI.

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SKILL.md

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Merge Post-Connection Implementation

The post-connection experience covers everything customers interact with after an integration is first connected: visibility into sync health, self-service relinking, and configuration. Without it, connections silently drift, credentials expire, and support tickets flood in.

First activation: self-introduce

I'm the implementing-post-connection skill. I'll guide you through the integration management experience users see after connecting. Which part do you need first — a settings page, sync status display, or relinking support?

Prerequisites

Merge Link implementation must be complete: a linked_accounts table exists with an account_token column storing the Merge account token per customer.

Implementation Steps

Work through these steps in order. Steps 2–6 invoke focused sub-skills; Step 1 runs inline.

Step 1: Load context

Do not write any code in this step. Read the reference docs first, then scan the codebase, then confirm readiness.

1a. Read these reference docs:

  • ../implementing-link/references/platform-overview.md — Merge concepts and account lifecycle
  • ../implementing-link/references/backend-implementation.md — Backend patterns and sync implementation
  • references/post-connection-fundamentals.md — Initial sync best practices, error messaging, custom fields, and filtering options

1b. Scan the codebase. Ask the user first:

"I'll search your codebase for existing settings pages, error handling, and the linked_accounts schema. Ready to proceed?"

Then identify:

  • Tech stack: language, framework, ORM, frontend library (React, Vue, Svelte, vanilla, etc.)
  • Existing settings/account page: routes, views, or files named settings, account, admin, integrations, preferences. Record the exact file path or not found.
  • Error-handling patterns: existing user-facing error messages or banner components.
  • Existing relinking or re-authentication flows.
  • linked_accounts schema: columns currently present, particularly status, error_category, initial_sync_complete.
  • Backend Merge SDK installed? Search the project's manifest for the language-appropriate package: @mergeapi/merge-node-client (package.json), MergePythonClient (requirements.txt / pyproject.toml), dev.merge:merge-java-client (pom.xml / build.gradle), merge-go-client (go.mod), merge_ruby_client (Gemfile), Merge.Client (.csproj). Record yes/no and which language.
  • React Merge Link SDK installed? If the frontend is React, also search for @mergeapi/react-merge-link. Record yes/no (or N/A).

1c. Confirm readiness with a brief summary:

  1. Tech stack identified (language, framework, ORM, frontend library)
  2. Reference docs loaded (list the three files read)
  3. Existing settings page: {file} or not found
  4. linked_accounts schema (relevant columns present / missing)
  5. Backend Merge SDK installed: yes / no
  6. React Merge Link SDK installed: yes / no / N/A

1d. Ask all unresolved questions in one message before proceeding to Step 2:

Before I start building, I have a few quick questions:

  1. Which sub-skills do you want to run? Pick any combination — I'll invoke them in order:

    • Settings page (Step 2 — recommended baseline)
    • Sync status visibility (Step 3)
    • Relinking + error messaging (Step 4)
    • Custom field selection (Step 5 — needs Merge Enterprise plan)
    • Data-scope filtering (Step 6 — required if customers control which records sync)

  2. Settings page surface (only if Step 2 is selected): [If found:] I found {file} as your existing settings/account page — I'll insert an "Integrations" section there. Is that correct? [If not found:] I didn't find an existing settings page. Do you have design mockups, or should I generate a new page matching the visual style of your existing pages?

  3. Backend SDK preference: [If not installed:] Would you prefer the official Merge SDK (recommended — handles types and retries) or raw HTTP? [If already installed:] I see the Merge SDK is in your dependencies — I'll use it unless you prefer raw HTTP.

  4. Frontend SDK (React projects only): [If @mergeapi/react-merge-link not installed:] Would you prefer the React Merge Link SDK (@mergeapi/react-merge-link, recommended) or CDN+vanilla JS? [If already installed:] I see @mergeapi/react-merge-link in your dependencies — I'll use it unless you prefer the CDN approach. [If not React:] Skipped.

Record the user's answers. Carry them as context into all sub-skills (Steps 2–6).

Step 2: Build integration settings page → invoke post-connection-build-settings-page

Build the dedicated settings page that lets end users manage their connected integrations — reconnect, view health status, persist per-integration configuration, and adjust scope. (Absorbs the standalone configure flow: settings UI structure and the underlying persistence model are now treated as one artifact.)

Before invoking the sub-skill: Use the existing-settings-page finding from Step 1d.

  • If an existing page was found: pass the file path so the sub-skill modifies it rather than creating a new one.
  • If mockups were provided: pass the mockups so the sub-skill implements to spec, matching the app's component library.
  • If no existing page and no mockups: the sub-skill will generate a new page matching the visual style of existing pages.

Step 3: Surface sync status to users → invoke post-connection-surface-sync-status

Make the initial sync timeline visible to end users so they aren't left wondering whether the connection worked.

Step 4: Implement relinking + error messaging → invoke post-connection-implement-relinking

Wire up first-class relinking and detailed error surfacing for revoked credentials, missing scopes, and stale connections.

Step 5: Enable custom field selection → invoke post-connection-enable-custom-fields

Let customers select and enable custom fields from their connected system using Merge's Field Mapping API.

Step 6: Establish data-scope filtering strategy → invoke post-connection-data-scope-filtering

Pick a pre-storage or post-storage filtering strategy for the data your customers actually need (employees in HRIS, candidates in ATS, accounts in CRM, tickets in Ticketing, etc.). Required when customers need control over which records are synced.

Troubleshooting

SYMPTOM: Settings page shows "connection healthy" but sync has been failing for days
CAUSE: Status is read from local linked_accounts.status field which was never updated from Merge Issues API
FIX: Poll GET /issues?linked_account_id=<id> and surface any ONGOING issues as warnings alongside the local status

SYMPTOM: Relink button triggers a new connection instead of relinking the existing one
CAUSE: /api/merge/create-link-token is called without end_user_origin_id matching the existing account
FIX: Always pass the existing end_user_origin_id when generating a relink token; Merge will attach it to the same Linked Account

SYMPTOM: Field Mapping API returns no remote fields for a customer
CAUSE: Remote data was not enabled for this Linked Account's category
FIX: Enable remote data in Merge dashboard → Linked Account → Settings, or set via the configuration API before fetching fields

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