Reference
TERMINAL_READER_BUSY
Terminal reader is busy
Terminal reader is busy
HTTP status 409 Conflict, code TERMINAL_READER_BUSY.
What it means#
The reader is already taking a payment or doing another action, so it cannot take this one (or be removed).
What to do#
Wait for the current payment to finish, or cancel it, then try again.
On the wire#
Every error response carrying this code names this page in error.moreInfo,
with the request id in the query string. See Error codes for
the response shape and the list of every code.