FNS Check Receipt

The FNS KKT Online service provides a public API for checking the authenticity of fiscal receipts issued by online cash registers (ККТ). This is a free service by the Russian Federal Tax Service (ФНС) that requires no authentication.

With the FNS Check Receipt integration in AACFlow, you can:

Verify receipts: Check whether a fiscal receipt is authentic and retrieve its details

This integration is useful for fraud prevention, automated receipt validation, and expense management workflows.

Usage Instructions

Integrate FNS Check Receipt into the workflow. No API key is required — the service uses public FNS endpoints. Provide the receipt parameters printed on the physical receipt (FN, FD, FP numbers and date/time).

Tools

`fns_receipts_check`

Verify a fiscal receipt

Input

Parameter	Type	Required	Description
`fn`	string	Yes	Fiscal drive number (ФН)
`fd`	string	Yes	Fiscal document number (ФД)
`fp`	string	Yes	Fiscal sign (ФПД)
`date`	string	Yes	Receipt date and time (YYYY-MM-DDTHH:MM)
`sum`	number	Yes	Receipt total in kopecks

Output

Parameter	Type	Description
`valid`	boolean	Whether the receipt is authentic
`items`	array	Array of receipt line items
`total`	number	Total amount
`dateTime`	string	Receipt date and time
`success`	boolean	Whether the check succeeded