VERIFIED SOLUTION i

Populating Mail.dat Payment Account Number field in MailStream Plus

all versions, all platforms
Per the Mail.dat Standards, MPA-1127 is the 'Payment Account Number'.  This field gets populated by using the subkeyword MDPMT# on a PA INF or RP INF parameter.   Please refer to the MailStream  Plus™ Guide for additional information about the subkeyword or the parameters.
UPDATED:  May 23, 2018