Payment Processing Developer Guide

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Cloud9 Payment Gateway Documentation. This site can also be reached at

Environment & Client Options

Being a cloud based system, Cloud9 has few restrictions on the integration options. The following are some of the possibilities:

  • Windows
  • Web Browser
  • Unix/Linux
  • Android
  • iOS
  • OS X
  • Custom


Cloud9 Payment Gateway

Cloud9 is essentially a multi-merchant/multi processor switch. Cloud9 reduces the complexity of direct processor and payment terminal programming, certification and compliance by presenting a simple unified interface to the developer with numerous interface options. The core communications are conducted via TLS/SOAP/JSON with wrappers in C/C++/Java, if desired.

Back-Office Reporting Gateway

Cloud9 has a full suite of Back Office Reporting, which can be extended and scripted.

Payment Device Controller (PDC)

Optional Payment Device Controller (PDC) hides the complexity of low level communications with the payment terminals and adds Offline Store & Forward functionality, if desired. The client (POS/web page/mobile device, etc) can communicate with the PDC, which will in turn control the payment perminal/pin pad and relate the processing instructions to the Cloud9 Payment Gateway. This is the easiest form of integration and it is recommended.
Note: Variations of Payment Device Controller are Payment Mobile Controller (PMC) and Payment Web Controller (PWC), dealing with mobile and web based payment processing functionality respectively.

→ OPTION1: Local Payment Device Controller with Store and Forward Capability

Main Cloud9 Payment Processing Gateway Integration Diagram
The client can communicate with a local Payment Device Controller (PDC) via SOAP, JSON or using the wizard like wrapper, written in C/C++/Java.

→ OPTION2: No Local Software - Direct Cloud Connection to Cloud9 Payment Web Controller (PWC)

Cloud9 PWC Direct Integration Diagram
The client can communicate directly with the cloud Payment Web Controller (PWC) via SOAP, JSON or using the wizard like wrapper, written in C/C++/Java.

Payment Device Controller Setup

Please, see Cloud9 Payment Device Controller Setup

System & Process Diagrams

POS System Diagram


Cloud9 Process Diagram


Understanding AVS

If you need to enforce AVS (Address Verification), you can set IgnoreAVSresult API option to N (NO). If you do so, your software must use post processing to determine the reason for decline and proceed accordingly (not all decline reasons are critical in all conditions).
We have an extensive list of AVS match options.
See this link for: AVS response codes.
The Flow

  1. AVS pass - ok?
  2. IF AVS NOT pass - check the AVS Response Code to decide if to proceed.

​Please only check the first 5 digits of zip codes

Integration Options and Working Samples

Please choose the integration scenario below, to dive into more detail:

Web Browser Samples

Web Browser Integration Samples


JSON API Documentation

MS Windows Samples

Windows Integration Samples

iOS Integration Samples

iOS Integration Samples

Android Integration Samples

Android Integration Samples


Payment Processing API Documentation

From the makers of Cloud9 Payment Processing Gateway and Creditline Credit Card Processing Software