Python Mockup for Payment Simulation

Introduction

A complete simulation of payment system using python flask. I simulate end2end call from client to the host (financial institutions) which mostly communicate using ISO8583. Below is the information flow:

API CALL <-- (Rest/Json) --> API Server <-- (Rest/Json) --> ISO Client Server <-- (ISO8583) --> ISO Server

Requirements

• Python 3.7
  
• Python 3.7 environment

Setup Virtual Environment

bondhan@ubuntu:~$ ls
env  workspace
bondhan@ubuntu:~$ source env/bin/activate
(env) bondhan@ubuntu:~$

Installing requirements

(env) bondhan@ubuntu:~$ pip3.7 install -r requirements.txt

Running

API Server

(env) bondhan@ubuntu:~/workspace/python/Py_TestLang$ cd src/apiserver/
(env) bondhan@ubuntu:~/workspace/python/Py_TestLang/src/apiserver$ gunicorn -w 25 -b 0.0.0.0:5000 main_api_server:app_apiserver

ISO Client Server

(env) bondhan@ubuntu:~/workspace/python/Py_TestLang/src/iso_client$ gunicorn -w 25 main_iso_client:app_isoclient -b 0.0.0.0:8080

ISO Server

(env) bondhan@ubuntu:~/workspace/python/Py_TestLang$ cd src/iso_server/
(env) bondhan@ubuntu:~/workspace/python/Py_TestLang/src/iso_server$ python3.7 main_iso_server.py

Database

• First run src/sql_db/01_schema_pylang.sql
• populate the database by running python3.7 initialize_data_v2.py

Testing

(env) bondhan@ubuntu:~/workspace/python/Py_TestLang$ cd src/customer_input/
(env) bondhan@ubuntu:~/workspace/python/Py_TestLang/src/customer_input$ python3.7 payment_test_v2.py

Notes

The result could differ based on the machine configuration, how many thread, core processor, etc.. Initial test showing 1000 requests took 6.974648475646973 seconds on vmware ubuntu linux server, 4 GB, 8 cores, 25 gunicorn workers with 50 threads testing threads