Supergood | BlackLine API
Programmatically access BlackLine’s finance close and AR automation data—account reconciliations, journal entries, close tasks, and cash application signals—via a stable REST API. Supergood builds and operates production-grade, unofficial BlackLine integrations so your team can automate reconciliations, close status reporting, and ERP posting without heavy custom engineering.
BlackLine is software that helps corporate accounting and finance teams automate the financial close. It centralizes account reconciliations, transaction matching, journal preparation and approval, close task management, and AR cash application so teams can certify balances and post entries to ERP on time with strong controls.
With an unofficial API, you can pull reconciliation status by period, create journals programmatically for approval/posting, synchronize close tasks to your project tools, and push remittance data for cash application—directly inside your finance operations workflows.
If you’re a tech company integrating BlackLine, you can ingest trial balances and subledger totals to seed reconciliations, add evidence and attachments at scale, surface real-time certification status in your product, trigger journal workflows from detected variances, and export audit trails to your GRC or data warehouse. You can also route close tasks into ticketing and alerting systems, and enrich AR cash application with bank statement or remittance data from your app.
What is BlackLine?
BlackLine is a cloud platform for Finance & Accounting automation. It focuses on closing the books and strengthening financial controls by standardizing and automating:
- Account Reconciliations and Certification
- Journal Entry management (preparation, approval, ERP posting)
- Transaction Matching and Variance Analysis
- Close Orchestration and Task Management
- Intercompany Accounting and AR Cash Application
Common data entities:
- Accounts, entities, and periods (close calendars)
- Reconciliations (prepared, certified, approved) and templates
- Journal entries and line items (with posting status and ERP references)
- Close tasks, checklists, dependencies, owners, and SLAs
- Transactions, matching rules, variances, and attachments
- Users, roles, approvals, and audit logs
The BlackLine Integration Challenge
For startups selling into finance teams that rely on BlackLine, turning portal-centric close workflows into automated pipelines introduces hurdles:
- Product mix and entitlements: Modules vary by customer (Recs, Journals, Cash App), affecting accessible data and actions
- Enterprise security controls: SSO/MFA, SCIM user provisioning, and network restrictions complicate headless automation
- ERP dependencies: Posting paths differ across SAP, Oracle NetSuite, and other ERPs; period locks and posting calendars must be respected
- Close timing and gates: Periods open/close, approvals, and task dependencies can block writes if not sequenced correctly
- Evidence and auditability: Attachments, sign-offs, and certification history need consistent capture and export
- Data normalization: Chart of accounts, entities, currencies, and period conventions differ across customers
How Supergood Creates BlackLine APIs
Supergood reverse-engineers authenticated browser flows and network interactions to deliver a resilient API endpoint layer for your BlackLine workflows.
- Handles username/password, SSO/OAuth, and MFA (SMS, email, TOTP) securely
- Maintains session continuity with automated refresh and change detection
- Normalizes responses so you can integrate once and rely on consistent objects across capabilities
- Aligns with customer entitlements, period locks, and approval workflows to ensure compliant access
Use Cases
Reconciliation Status and Evidence Sync
- Pull reconciliation inventories by period, entity, and status
- Attach supporting documents and variance explanations programmatically
- Mirror certification state into your finance ops, GRC, or BI tools
Journal Workflow Orchestration
- Create journals from detected variances, provisions, or accruals n- Route for approval and track posting status back from ERP
- Apply templates, policies, and dynamic lines at scale
Close Task Automation
- Sync close tasks to ticketing or on-call alerting tools
- Drive SLAs with real-time status and dependency tracking
- Centralize exceptions and reassignments in your platform
AR Cash Application Enrichment
- Push remittance advice or bank statement lines to improve matching
- Monitor applied/remaining balances for downstream collections
- Export matches and exceptions for customer communications
Available Endpoints
Authentication
POST /auth/sessions: Establish a session using credentials. Supergood manages MFA (SMS, email, TOTP) and SSO/OAuth when enabled. Returns a short-lived auth token maintained by the platform.
curl --request POST \
--url https://api.supergood.ai/integrations/<integration_id>/auth/sessions \
--header 'Authorization: Basic <Base64 encoded token>' \
--header 'Content-Type: application/json' \
--data '{
"username": "[email protected]",
"password": "<password>",
"mfa": { "type": "totp", "code": "123456" },
"ssoProvider": null
}'
Example response
{
"authToken": "eyJhbGciOi...",
"expiresIn": 3600,
"user": {
"id": "u_7a12df",
"name": "Controller One",
"entitlements": ["reconciliations", "journals", "close_tasks"]
}
}
POST /auth/sessions/refresh: Refresh an existing token to keep sessions uninterrupted.
Reconciliations
POST /reconciliations: Create or upsert an account reconciliation for a given period, including balances and ownership.
curl --request POST \
--url https://api.supergood.ai/integrations/<integration_id>/reconciliations \
--header 'Authorization: Bearer <authToken>' \
--header 'Content-Type: application/json' \
--data '{
"accountId": "1000-001",
"entity": "US01",
"period": "2025-12",
"currency": "USD",
"glBalance": 125000.23,
"subledgerBalance": 124500.23,
"unreconciledAmount": 500.00,
"templateId": "tmpl_std_cert",
"preparerId": "u_234",
"dueDate": "2026-01-10",
"explanations": [
{"type": "timing", "amount": 500.00, "note": "Deposit in transit 12/31"}
],
"attachments": [
{
"filename": "bank_statement_dec.pdf",
"contentType": "application/pdf",
"data": "<base64>"
}
],
"referenceId": "recon-AR-clearing-dec25"
}'
Example response
{
"reconciliationId": "rec_8b92da",
"status": "prepared",
"createdAt": "2026-01-22T15:21:09Z",
"referenceId": "recon-AR-clearing-dec25",
"workflow": {"preparerId": "u_234", "approverId": null}
}
GET /periods/{period}/reconciliations: Retrieve normalized reconciliation summaries for a close period, filterable by entity, account, and status.
curl --request GET \
--url 'https://api.supergood.ai/integrations/<integration_id>/periods/2025-12/reconciliations?entity=US01&status=pending_approval' \
--header 'Authorization: Bearer <authToken>'
Example response
{
"period": "2025-12",
"items": [
{
"reconciliationId": "rec_8b92da",
"accountId": "1000-001",
"entity": "US01",
"status": "pending_approval",
"glBalance": 125000.23,
"unreconciledAmount": 500.00,
"preparer": {"id": "u_234", "name": "J. Patel"},
"dueDate": "2026-01-10",
"certifications": {"preparedAt": "2026-01-02T11:00:00Z", "approvedAt": null}
}
],
"summary": {"total": 1, "byStatus": {"prepared": 0, "pending_approval": 1, "approved": 0}}
}
Journal Entries
POST /journal-entries: Create a journal entry and initiate approval/posting according to policy.
curl --request POST \
--url https://api.supergood.ai/integrations/<integration_id>/journal-entries \
--header 'Authorization: Bearer <authToken>' \
--header 'Content-Type: application/json' \
--data '{
"journalDate": "2025-12-31",
"period": "2025-12",
"entity": "US01",
"currency": "USD",
"memo": "Accrual: Dec utilities",
"lines": [
{"accountId": "6100-UTIL", "debit": 12500.00, "credit": 0.0, "description": "Utility expense"},
{"accountId": "2100-ACCR", "debit": 0.0, "credit": 12500.00, "description": "Accrued expenses"}
],
"attachments": [],
"postingPolicy": {"postToErp": true, "erpSystem": "SAP", "autoNumber": true},
"referenceId": "jrnl-UTIL-2025-12"
}'
Example response
{
"journalId": "jrn_4c17f1",
"status": "pending_approval",
"workflow": {"preparerId": "u_234", "approverId": "u_389"},
"erpPosting": {"status": "queued", "erpSystem": "SAP", "postingRef": null},
"createdAt": "2026-01-22T16:03:11Z",
"referenceId": "jrnl-UTIL-2025-12"
}
Close Tasks
GET /close/tasks: List close tasks for a period with owners, dependencies, and progress.
curl --request GET \
--url 'https://api.supergood.ai/integrations/<integration_id>/close/tasks?period=2025-12&entity=US01' \
--header 'Authorization: Bearer <authToken>'
Example response
{
"period": "2025-12",
"tasks": [
{
"taskId": "task_aa9210",
"name": "Certify Cash Reconciliation",
"owner": {"id": "u_234", "name": "J. Patel"},
"status": "in_progress",
"dueDate": "2026-01-05",
"dependencies": ["task_ba3311"],
"links": {"reconciliationId": "rec_8b92da", "journalId": null},
"checklistSection": "Cash & Banking"
}
],
"summary": {"total": 1, "byStatus": {"not_started": 0, "in_progress": 1, "complete": 0}}
}
Technical Specifications
- Authentication: Username/password with MFA (SMS, email, TOTP) and SSO/OAuth where enabled; supports service accounts or customer-managed credentials
- Response format: JSON with consistent resource schemas and pagination
- Rate limits: Tuned for enterprise throughput while honoring licensing and usage controls
- Session management: Automatic reauth and cookie/session rotation with health checks
- Data freshness: Near real-time retrieval of reconciliations, journals, tasks, and attachments
- Security: Encrypted transport, scoped tokens, and audit logging; respects BlackLine entitlements and period locks
- Webhooks: Optional asynchronous delivery for long-running approvals and ERP posting callbacks
Performance Characteristics
- Latency: Sub-second responses for list/detail queries under normal load
- Throughput: Designed for high-volume period-close polling and journal creation
- Reliability: Retry logic, backoff, and idempotency keys minimize duplicate actions
- Adaptation: Continuous monitoring for UI/API changes with rapid adapter updates
Getting Started
- Schedule Integration Assessment
Book a 30-minute session to confirm your BlackLine modules, licensing, and authentication model.
- Supergood Builds and Validates Your API
We deliver a hardened BlackLine adapter tailored to your workflows, policies, and entitlements.
- Deploy with Monitoring
Go live with continuous monitoring and automatic adjustments as BlackLine or your ERP stack evolves.
Frequently Asked Questions
Q: Which BlackLine products can this integration cover?
Supergood supports workflows across Reconciliations, Journals, Close Tasks, and AR Cash Application, subject to your licensing and entitlements. We scope coverage during the integration assessment.
Q: How are MFA and SSO handled for automation?
We support username/password + MFA (SMS, email, TOTP) and can operate behind SSO/OAuth when enabled. Sessions are refreshed automatically with secure challenge handling.
Q: Can I create journals and post them to ERP through this API?
Yes—where permitted by your policies. You can create journals, route for approval, and submit for ERP posting. We honor period locks, approval gates, and customer-specific posting rules.
Q: How do you normalize reconciliation and task data?
We standardize accounts, entities, statuses, balances, and workflow metadata into consistent objects so your downstream systems don’t need to handle tenant-specific schemas.
Related Integrations
SAP ERP API - Programmatically sync journals and master data with Supergood
Ready to automate your BlackLine workflows?
Supergood can have your BlackLine integration live in days with no ongoing engineering maintenance.
