# GPA Getting started
**Global Payment Application (GPA)** is a standard payment solution for **Engage** platform. It delivers a consistent cross-device experience and supports regional and local customization through a plug-and-play model.
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Please login or register to gain access to the detailed material on this page.
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LoginRegister for an Account
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### What you will find in this space
* End-user and operator guides for GPA devices.
* Integration guides for NEXO and semi-integrated deployments.
* Technical reference for payment features, configuration, operations, and security.
* Developer toolkits for POS and host module.
* Installation, migration, download, and support material.
### Quick Start
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### Unlocking GPA
Start here to understand what GPA is and how the solution is structured.
These pages explain the core application model and the main design patterns used across deployments.
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{% if visitor.isSet === true %} GPA OverviewSolution Design Patterns
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### GPA Downloads
Download the latest GPA package and explore the release notes to see what’s new.
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{% if visitor.isSet === true %} GPA Downloads and Release Notes
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### Application Loading
Load GPA onto the terminal before setup begins using IDS or SYSMODE.
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### Terminal Setup
Complete terminal setup after the application is loaded.
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This path will guide a **warehouse engineer** through the GPA installation process, in order to prepare the terminal for the merchant.
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{% if visitor.isSet === true %} Warehouse Install Guide
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This path fits on-site terminal setup where the device is configured during installation.
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{% if visitor.isSet === true %} Self Installation Guide
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### Define your Next Step
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### Integrate with an ECR or POS
Start here for semi-integrated payments and NEXO message flows.
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{% if visitor.isSet === true %} Nexo ECR GuideGPA Semi-Integrated Solution
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### Build or Customize GPA
Start here for architecture, behavior, data models, and toolkit flows.
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### Migrate GPA
Start here to plan and execute a version upgrade.
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{% if visitor.isSet === true %} Migration Guides 1.3 to 2.6
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### Troubleshoot and Support
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Start here to diagnose issues in the field and resolve common support tasks.
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### Further Reading
* [User Guide](broken://spaces/JQkY7HQfm8TbTXU9l4th/pages/Llo1VMQwrhBcSIOVNm5j) for payment flows, device behavior, and operator tasks.
* [SDI Client](broken://spaces/JQkY7HQfm8TbTXU9l4th/pages/jD442nnQuOjCmk5mSwPl) for client integration, card APIs, and EMV configuration.
* [Setting Connection](broken://spaces/JQkY7HQfm8TbTXU9l4th/pages/4z7NYJ7dvsUPgwBHreYe) for transport and network setup options.
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