Finance & ERP · Integration
BlackLine
Add BlackLine to your product for your customers, and give your AI agents governed access to it.
Embed a BlackLine integration so your customers can work their own account reconciliations, journal entries, and financial close tasks from inside your product, with governed agent access to the same records. Writes are idempotent, so a retry after a timeout does not post an entry twice, and every call is logged per tenant so a posting can be traced to the event that created it. Each customer's account structures and required fields are mapped as configuration rather than hard-coded.
In your product
Embedded for your customers. Per-tenant auth, no per-customer code, maintained by fastn.
Let customers connect their own BlackLine environment and read account reconciliations and their status into your product.
Create and update journal entries from your product with idempotent writes so a retry cannot post twice.
Read close checklist tasks and their owners so month-end progress is visible where the team already works.
Trigger your product when a reconciliation is certified or a close task changes status.
For your AI agents
Governed, audited access for the agents you build, through the MCP server.
An agent reads unreconciled accounts and summarises what is holding up the close.
An agent prepares a journal entry for review within governed permissions, with the action audited.
An agent reacts to an overdue close task and notifies its owner.
Example prompt
List account reconciliations still uncertified for the current period and show the assigned preparer.
Set up BlackLine in 4 steps
- 01Open the BlackLine connector from your fastn dashboard.
- 02Have each customer authenticate their own BlackLine environment with least-privilege scopes.
- 03Map their account structures, entry fields, and close task types, then enable actions and triggers.
- 04Call them from your product, or expose them to an agent through the MCP server.
Why teams use the BlackLine integration
What you get by embedding it with fastn instead of building it yourself.
- Ship a BlackLine integration without building it. Your customers connect their own BlackLine account inside your product and work their invoices, payments and vendors there, with no per-customer code on your side.
- Handle the part that actually costs time: financial writes must be idempotent and reconcilable, because a duplicate is an accounting problem rather than a bug. fastn owns the auth, token refresh, rate limits, pagination and breaking-change fixes, so a BlackLine update is not your on-call problem.
- One integration serves your product and your agents. The same governed BlackLine connection powers in-product features and gives AI agents scoped, audited access, so you move financial records without hand-keying them between systems without wiring it twice.
Used by these teams
Compare with
NetSuite
BrexWorks well with
BlackLine ReportsOften used alongside
Tools the same teams tend to run next to BlackLine, across other categories.
Shopify
Stripe
BigCommerce
AfterShipBlackLine integration FAQ
How do I add a BlackLine integration to my product?
Enable the BlackLine connector in your fastn dashboard, then let each customer authenticate their own BlackLine account. fastn handles the OAuth flow, token storage and refresh per tenant, so there is no BlackLine client code in your app and no per-customer branch in your codebase. Setup is 4 steps.
Do my customers each connect their own BlackLine account?
Yes. Every connection is scoped to the individual customer, so each authorises their own BlackLine account and only ever sees their own invoices, payments and vendors. That per-tenant isolation is the point of an embedded integration: you support the long tail of customer setups without maintaining an integration per customer.
Can AI agents use this BlackLine integration?
Yes. The same connection is exposed to your agents through the fastn MCP gateway, with permissions scoped per tenant and every call audited. An agent reads unreconciled accounts and summarises what is holding up the close.
Who maintains the BlackLine integration?
fastn does. When BlackLine changes an endpoint, deprecates a field or alters its auth, the fix lands in the connector rather than in your backlog, and your customers' connections keep working.
Is the BlackLine integration safe for financial writes?
Writes are idempotent, so a retry after a timeout does not post a document twice, and every call is logged per tenant so an entry can be traced back to the event that created it. That matters more in finance than anywhere else, because a duplicate is a number somebody has to explain.
Can it handle each customer's own chart of accounts?
Yes. ERP deployments are configured to the business, so account structures, required fields and fiscal calendars differ per customer. Those are mapped per tenant as configuration, not hard-coded.
What about BlackLine rate limits during a first import?
Backfills are throttled deliberately. ERP limits are often account-wide rather than per-integration, so an unthrottled import can exhaust a customer's allowance and disrupt their other integrations.
What can I build with the BlackLine integration?
A common starting point: connect their own BlackLine environment and read account reconciliations and their status into your product. Teams also use it for the other use cases listed above, and expose it to agents for governed reads and writes.
How much does the BlackLine integration cost?
It is included. Pricing is based on connected accounts, not on how many connectors you enable, so adding BlackLine does not change your per-connector cost. You can start free with 3 connected accounts.
Add BlackLine to your product
Start free with 3 connected accounts. No sales call required, and no per-customer integration code.