Does Keystone Information Systems have an API?

Does Keystone Information Systems publish a public API?

No. Keystone Information Systems, the government-focused accounting platform from keyinfosys.com, does not publish a public API or developer documentation. Keystone acts as a full systems integrator for its municipal and public-sector customers, and its integration work happens inside that relationship rather than through an open developer program.

Because Keystone runs on-premise, there is also no cloud endpoint for a third-party tool to call. Any data that enters the system arrives either through Keystone's own modules or through file imports.

What does no public API mean for expense automation?

It means no expense or card platform, Vergo included, can claim a live, automated sync with Keystone Information Systems. If a vendor tells you their card program "integrates directly" with Keystone, ask to see the connection working, because there is no published interface for one to be built on.

In practice, finance teams running Keystone handle card activity the manual way: download a statement, re-key or reformat transactions, and import or enter them into the ledger. That process is slow and error-prone, and it is exactly the gap file-based automation is built to close.

How does Vergo work with Keystone Information Systems without an API?

Through custom-built CSV exports matched to the import format Keystone expects. The workflow looks like this:

• Card transactions land in Vergo in real time, where they are coded to your accounts and enriched with receipts and memos.
• When you are ready to post, Vergo generates a structured CSV file shaped to Keystone's import layout — columns, ordering, and formatting matched to what the system accepts.
• You import that file into Keystone the same way you would any other batch file.

The coding, receipt collection, and approval work happens in Vergo; Keystone receives a clean, ready-to-import file instead of a stack of statements to re-key.

Is a file-based connection reliable enough?

For a system without a public API, a matched file export is the working automation path — and it is how on-premise government accounting systems have exchanged data for decades. The failure mode of file imports is formatting drift, which is why Vergo builds the export to Keystone's specific import format rather than handing you a generic CSV to rework.

The rest of the expense workflow — real-time transaction visibility, receipt capture at the point of purchase, coding against your chart of accounts, and approvals — happens in Vergo before the file is ever generated. By the time a batch reaches Keystone, it has already been reviewed and reconciled, which is a stronger control posture than re-keying from a bank statement weeks after the fact.