September 29, 2026

This entry covers the API changes released on September 29, 2026.

New unified response codes

We’ve added new decline and error codes to the Pay In unified response codes reference, including a new section for 3-D Secure (3DS) authentication declines. These codes apply to Pay In transactions made with v2 of the API.

3-D Secure decline codes

The D2001-D2049 range is now reserved for 3DS-related declines. Codes D2001 through D2023 cover issuer declines and challenges, cardholder authentication failures, duplicate authentication values, and 3DS processing errors. All return HTTP status 402.

Other new response codes

Code	HTTP Status Code	Reason
`D0328`	402	Invalid amount or currency
`D0482`	402	Missing or incorrect wallet type
`D0533`	402	Invalid MAC received
`E5050`	400	Surcharge not allowed for card type
`E5051`	400	Surcharge not allowed for non-US issued card
`E5052`	400	Surcharge not allowed at this paypoint location
`E5053`	400	Surcharge not allowed for payor’s location
`E5054`	400	Paypoint not registered for surcharging
`E5055`	400	Surcharge not allowed with service fee
`E5056`	400	Calculated surcharge amount mismatch
`E7069`	400	Device busy
`E9070`	400	Device timeout
`E9075`	400	Transaction canceled by user

See the Pay In unified response codes reference for the full description and resolution text for every code.