Field-first capture that feeds Procore, not competes with it.
GridLine is the mobile operations layer for pours, daily logs, QC, and photo evidence. Everything captured in the field arrives in Procore as clean, structured, attributable data. This page documents the integration architecture, authentication model, sync directions, and reliability design.
Better together
Complementary layers, one record of truth. Joint customers keep Procore as the system of record and gain a field layer built for gloves, dust, and dead zones.
Crews log pours, QC, photos, and manpower on a phone in poor connectivity. Structured records land in Procore already clean.
PMs keep working in Procore. Foremen and supers never have to learn a second office tool.
Offline-first capture plus AI assist raises daily-log completion rates, which makes downstream Procore reporting materially more accurate.
Integration workflow
Data flow from field capture through the auth boundary into Procore, with rate-limit governance and failure handling on the return path.
FIELD CAPTURE GRIDLINE PLATFORM AUTH BOUNDARY PROCORE
───────────── ───────────────── ───────────── ───────
Daily Logs ┐
Pour / QC Cards │ Offline Outbox
Photos + AI Tags ├────▶ + Sync Engine
Observations │ │
Timecards ┘ ▼
Normalize / Validate
│
Field Mapping Store ◀──────────────────────── Projects, Users,
(GridLine project ↔ Cost Codes (pull)
Procore company + project)
│
▼
Integration Job Queue ────▶ OAuth 2.0 (PKCE) ────▶ Daily Log API
│ ▲ user context Observations API
│ │ Images API
│ │ Service Account ──────▶ Timecard API
│ │ client_credentials
│ │ │
│ │ Encrypted Token Vault
│ │ (rotating refresh)
│ │
│ Rate-Limit Governor ◀── 429 / Retry-After
│ (token bucket, per company)
│
├──▶ Sync Audit Log (immutable, per request ID)
└──▶ Dead Letter Queue ──▶ Admin resolution UI
Webhooks ◀──────────────────────────────────── project.updated,
(invalidate + reconcile) user.removedWhat syncs, and which way
| Object | Direction | Sync mode | Procore API |
|---|---|---|---|
| Projects, users, cost codes | Procore → GridLine | Pull on install, then webhook + nightly reconcile | Projects / Directory / Cost Codes |
| Daily logs (manpower, notes, weather) | GridLine → Procore | Push on submit, idempotent by external key | Daily Log |
| Concrete pour cards & QC results | GridLine → Procore | Push as structured log + attached PDF record | Daily Log / Documents |
| Jobsite photos + AI tags | GridLine → Procore | Batched push with location + date metadata | Images |
| Field observations & punch items | Bi-directional | Push on create, pull status changes via webhook | Observations |
| Timecards / labor hours | GridLine → Procore | Nightly batch, service account | Timecard Entries |
Authentication model
User-context OAuth 2.0
Interactive installs use the authorization-code flow with PKCE. The installing user's permissions define what GridLine can read or write, so Procore's own project and tool permissions remain the source of truth. Refresh tokens rotate and are stored encrypted at rest.
Service account (client credentials)
Unattended work — nightly timecard batches, directory reconciliation, webhook replay — runs under a scoped service account so it does not depend on any single employee remaining active in the Procore directory.
Multi-company install model
Installs are keyed by Procore company ID. A GridLine company can map many Procore projects, and tokens, rate budgets, and audit logs are partitioned per company so one tenant's activity can never affect another's.
Error handling & rate limits
Rate-limit awareness
A token-bucket governor sits in front of every Procore call, sized under the documented hourly quota per company. 429 responses honor Retry-After; sustained pressure sheds nightly batch work before it touches interactive syncs.
Retries & idempotency
Every push carries a deterministic external key so replays never duplicate records. Transient 5xx and network faults retry with exponential backoff and jitter, up to a bounded attempt budget.
Failure isolation
Permanent failures land in a dead-letter queue with the original payload and Procore error body, surfaced in an admin resolution screen. One bad record never stalls a project's sync stream.
Auditability
Each sync attempt writes an immutable audit row: object, direction, actor, Procore request ID, and outcome. Joint customers can reconcile any field record end to end.
Sandbox validation plan
Scenarios exercised against a Procore developer sandbox before certification review. Findings and gaps are tracked and resolved ahead of production install.
- Install and uninstall flow against a Procore developer sandbox company, including token revocation cleanup.
- Multi-company install: two sandbox companies mapped to one GridLine tenant, verifying token and rate-budget partitioning.
- Permission edge cases: installer lacking Daily Log write access, project archived mid-sync, user removed from directory.
- Duplicate-suppression test: replaying the same daily log 50 times to confirm idempotency keys hold.
- Rate-limit soak: intentional 429 storms to verify Retry-After compliance and graceful batch shedding.
- Offline burst: 200 queued field records synced at once after connectivity returns.
Reviewing GridLine as an integration partner?
Our security posture, subprocessor list, access controls, and vulnerability practices are documented in the Trust Center. Technical questions are welcome.