Contains a program command line specification that indicates how an external encryption program will work. Two placeholders, %p and %f, are defined, which are replaced at encryption time with the password and temporary file name respectively. See Order Security. This is separate from the PGP directive, which enables PGP encryption of the entire order.
If PGP is the encryption program (Interchange determines this by searching for the string pgp in the command string), no password field or file field need be used. The field mv_credit_card_number will never be written to disk in this case.
EncryptProgram /usr/local/bin/pgp -feat email@example.com
If the order Route method of sending orders is used (default in the demo), this sets the default value of the encrypt_program attribute.