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messageFunction

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Role (function) of the request sent to the acquirer. For example indicates if the request relates to an authorisation request or an authorisation reversal.

Format
ANS20(restricted values
ANS
Any character is accepted
restricted values
Indicates a restricted list of accepted values.

Values

ACCOUNT_VERIFICATION
Account verification (account status inquiry)
AUTHORISATION
Authorisation request message
REVERSAL
Authorisation reversal message (cancellation sent to the acquirer)