How the Positive Pay file gets transmitted to bank

Hello,

I have a Payment process profile defined as:

The Positive Pay file gets generated in the path as mentioned above but unable to find out how it gets triggered.

I have a shell script which is also registered as a concurrent program where the Prefix as mentioned above is there.

The Script is like as:

#!/bin/bash

SFTPLOG=/usr/tmp/sftp_pos`date +%m%d%y%H%M%S`.log

count=$( find /u01/prd/apps/apps_st/appl/test/12.0.0/Interfaces/bank -maxdepth 1 -mindepth 1 -type f -name 'TESTPOSP*.out'  -print| wc -l )

Please can anyone advise how the shell script is getting triggered when the user submits the PPR.