Example Call Flow (PAA-initiated pre-authentication) PaC l-PAA r-PAA PANA w/o P-flag set Pre-authentication trigger PSR w/ P-flag set PSA w/ P-flag set PAR/PAN exchange w/ P-flag set PBR/PBA exchange w/ P-flag set Pre-authorization Movement Post-authorization PUR w/o P-flag set PUA w/o P-flag set |