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Custom Shopping Cart

This script is transcribed from MyPaySystems PRO setup documentation (a pdf file), no online copy was easily available so I have mirrored this document here for easy reference

Table of contents

INTRODUCTION
BACKGROUND INFORMATION
1. HTML Forms
2. Form Submission
PREREQUISITES
SETUP
1. Overview
2. Line-by-Line Analysis
COMMON APPLICATIONS
TROUBLESHOOTING
GLOSSARY
APPENDICES
APPENDIX A: Input variables list
APPENDIX B: Output variables list
APPENDIX C: HTML source

5.1. Custom Shopping Cart

Custom shopping carts can be a problem in e-commerce. They are often incompatible and costly to develop. A merchant who has already developed a sophisticated shopping cart will not necessarily want to discard the investment such an application requires. Because a shopping cart normally contains a number of products, selected from a possibly huge product pool, it is not possible to predict the total amount of any purchase. The amount of a transaction may in fact be different for each consumer. With the myPaySystems-Pro system, it is possible to integrate almost any custom web-based shopping cart.

The work required to integrate a custom shopping cart with the myPaySystems- Pro application is really quite minimal. All a merchant must do is create an order finalization page, such as the one described in section 4, and send the myPaySystems-Pro order page the necessary parameters via the POST method of form submission.

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