Integration tool
OFS Message Builder
Build and validate OFS messages interactively. Select an application, add fields, and generate a correctly formatted OFS string ready to copy.
Use the toolTools / OFS
OFS tools for T24 integration.
OFS (Open Financial Services) is the real-time messaging protocol at the heart of T24. These tools help you build, parse, and troubleshoot OFS messages without manual comma counting.
Debugging tool
OFS Message Parser
Paste any OFS message string and see it decomposed into its five parts — operation, options, user info, record ID, and data fields.
Use the toolDebugging tool
OFS Error Decoder
Decode common T24 OFS error messages instantly. Paste any error code or message to get a human-readable explanation, causes, and next steps.
Use the toolWhat is OFS in T24?
OFS (Open Financial Services) is the real-time message-based protocol that Temenos T24 uses to process transactions, enquiries, and record updates. Every time an external system sends data to T24 — a payment instruction, a customer update, or an account creation — it sends an OFS message. Understanding OFS formatting is essential for T24 integration work, and these tools give you a visual way to build and inspect messages without guesswork.