Simple Order API and SOAP Toolkit API Documentation

If your integration method is Simple Order API or SOAP Toolkit API, here are your development resources:

Note: Simple Order API (32-Bit) & SOAP Toolkit API make the same calls. All developer documentation referring to Simple Order API is also relevant to SOAP Toolkit API.

Simple Order API

Documentation & Downloads 
Simple Order API Client for C/C++ Developer's Guide for Linux®
Simple Order API Client for Java Developer's Guide
Simple Order API Client for PHP Developer's Guide for Linux®
Simple Order API Client for Perl Developer's Guide for Linux®
Simple Order API Client for ASP Developer's Guide
Simple Order API Client for C/C++ Developer's Guide for Windows®
Simple Order API Client for Windows® .NET
Simple Order API Client for PHP Developer's Guide for Windows®
Simple Order API Client for Perl Developer's Guide for Windows®

SOAP Toolkit API

Documents 
SOAP Toolkits for Web Services Developer's Guide

Simple Order API & SOAP Toolkit API Developer Documentation

Tip: Software Development Kits contain API Client software, code samples, and release notes.
Documents 
Credit Card Services for the Simple Order API
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Credit Card Services Implementation Guide Supplement: Airline Data for the Simple Order API
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Credit Card Services Implementation Guide Supplement: Level II and Level III Processing for the Simple Order API
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Credit Card Services Implementation Guide Supplement: Retail POS for the Simple Order API
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Electronic Checks Implementation Guide for the Simple Order API
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Payment Tokenization with the Simple Order API
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Recurring Billing with the Simple Order API
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Tax Calculation Service for the Simple Order API
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Decision Manager Developer's Guide
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Payer Authentication Implementation Guide
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Global Payment Services Developer's Guide
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Verification Services Implementation Guide
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API Information for Chase Paymentech Direct Debit
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China Processing Implementation Guide
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Credit Card Services Implementation Guide: Bill Me Later
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Getting Started with CyberSource Advanced
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Multi-Currency Service: Chase Paymentech Solutions
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PayPal Express Checkout Implementation Guide
View  |  Download
PayPal Services Implementation Guide
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PIN-less Debit Card Services Implementation Guide
View  |  Download