# PayExplorer Connect SDK Integration Overview (/global/en/docs/Terminal/Integration-Overview) PayExplorer Connect SDK provides APIs for integrating payment terminal capabilities into your application, including financial transactions, device interaction, and transaction support. [Documentation Reading Route](#reading-route) · [Platforms](#platforms) · [Capabilities and Relationships](#features) · [Terminal Access Methods](#terminal) · [Integration Guides](#guides) ## Documentation Reading Route Use this index to choose documentation for the current question or integration activity. It is a reading route, not a required implementation sequence. For an existing project, go directly to the topic you need. Read only the relevant platform tab or section; a navigation group does not require reading every linked page. | Documentation topic | Read when needed | | -------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Platform and architecture | Check [Platforms](#platforms). Read [Solution Overview][solution] when you need to understand the SDK architecture and the roles of the application and payment terminal. | | Capabilities and terminal strategy | Check [Capabilities and Relationships](#features) and [Terminal Access Methods](#terminal). Consult [Terminal Configuration](#terminal-configuration-guides) or the relevant business guide when choosing a strategy. | | Terminal and project preparation | Read [Terminal Preparation][terminal-preparation] for the payment terminal and [Add SDK Dependency][dependency] for the application's SDK source, version, build configuration, and required iOS startup. | | Terminal configuration and iOS startup | For iOS, complete [iOS SDK Initialization][initialization] in the dependency guide. See [Terminal Configuration and Selection][terminal-selection] for terminal setup, and [Service Routing][service-routing] when multiple providers or per-request targets are involved. | | Capability implementation | Use [Accepting a Payment][payment-guide] as an example of the common Exchange flow, then follow the relevant business guides and consult [API Reference](#api-reference-guides) for request and response details. Check exact declarations against the SDK version in the project. | | Validation and troubleshooting | Use [Go-Live Checklist][validation], then [Error Codes][errors], [FAQ][faq], or related capability pages for the issue encountered. | Use [AI-Assisted Development](#ai-assisted-development-guides) for Skill installation or usage questions. Troubleshooting resources are available throughout integration. ## Platform Overview | Platform | SDK Guide | | -------- | ----------------------------------------------- | | Android | Android tab in [Add SDK Dependency][dependency] | | Windows | Windows tab in [Add SDK Dependency][dependency] | | iOS | iOS tab in [Add SDK Dependency][dependency] | “Supported” means the SDK provides the capability. See the feature documentation for terminal requirements and applicable conditions. ## Capability Support Matrix ### Financial Transaction Capabilities Overview: [Financial Services][financial-overview]. | Feature and Documentation | Purpose | Android | Windows | iOS | | -------------------------------------- | ---------------------------------------------- | --------- | --------- | --------- | | [Payment][payment] | Initiate a payment | Supported | Supported | Supported | | [Refund][refund] | Return funds from an original transaction | Supported | Supported | Supported | | [Reversal][reversal] | Reverse a completed transaction | Supported | Supported | Supported | | [Pre-Authorization][preauth] | Reserve an authorized amount | Supported | Supported | Supported | | [Pre-Auth Completion][completion] | Complete an existing pre-authorization | Supported | Supported | Supported | | [Authorization Adjustment][adjustment] | Adjust a pre-authorized amount | Supported | Supported | Supported | | [Reconciliation][reconciliation] | Reconcile transactions and settle the terminal | Supported | Supported | Supported | | [Balance Inquiry][balance] | Query an account or card balance | Supported | Supported | Supported | ### Device Interaction Capabilities | Feature and Documentation | Purpose | Android | Windows | iOS | | ------------------------- | --------------------------------------- | --------- | --------- | --------- | | [Display][display] | Display text, images, and other content | Supported | Supported | Supported | | [Print][print] | Print text or images | Supported | Supported | Supported | | [NFC Tag][nfc] | Process tag data | Supported | Supported | Supported | | [Transmit][transmit] | Forward ECR messages | Supported | Supported | Supported | ### Transaction Support Capabilities | Feature and Documentation | Purpose | Android | Windows | iOS | | -------------------------------- | ----------------------------------------------- | --------- | ---------------- | --------- | | [Abort][abort-api] | Abort an ongoing transaction | Supported | Supported | Supported | | [Message Status][status-api] | Query a transaction result or processing status | Supported | Supported | Supported | | [Event Notification][events-api] | Receive transaction progress events | Supported | Supported | Supported | | [Reprint][reprint] | Reprint a transaction receipt | Supported | No dedicated API | Supported | ### Transaction Relationships | Transaction or Capability | Related Capabilities or Records | Relationship | | --------------------------------------------- | ----------------------------------------------------------------------------------------------- | ------------------------------------------- | | Financial Transaction Capabilities | [Event Notification][events-guide], [Abort][abort-guide], [Message Status][status-guide] | Transaction progress and exception handling | | Pre-Authorization | [Pre-Auth Completion][completion], [Authorization Adjustment][adjustment], [Reversal][reversal] | Follow-up operations | | Pre-Auth Completion, Authorization Adjustment | Original pre-authorization transaction | Original transaction reference | | Refund, Reversal, Reprint | Original transaction | Original transaction reference | ## Terminal Access Methods ### Access Mode | Mode | Android | Windows | iOS | | ---------------- | --------- | ------------- | ------------- | | Same device | Supported | Not supported | Not supported | | Separate devices | Supported | Supported | Supported | Choose one access mode. Same device means the business application runs directly on the payment terminal; separate devices means it runs on another device. ### Communication Methods | Method | Android | Windows | iOS | | --------- | --------- | ------------- | ------------- | | LAN | Supported | Supported | Supported | | USB | Supported | Supported | Not supported | | UART | Supported | Supported | Not supported | | Bluetooth | Supported | Not supported | Not supported | For separate-device access, one or more supported communication methods can be enabled. See [Terminal Configuration and Selection][terminal-selection] for terminal selection and management, and [Service Routing][service-routing] for selecting among multiple terminals and services. ## Integration Guides ### Capability Overview - [Platform Overview](#platforms) - [Capabilities and Relationships](#features) - [Terminal Access Methods](#terminal) ### Concepts and Architecture - [Solution Overview][solution] - [Semi-Integration Overview][semi-overview] - [Introduction][introduction] ### Environment and SDK Setup - [Terminal Preparation][terminal-preparation] - [Add SDK Dependency][dependency] - [iOS SDK Initialization][initialization] ### Terminal Configuration - [Terminal Configuration and Selection][terminal-selection] - [Service Routing][service-routing] ### Integration Workflows - [Accepting a Payment][payment-guide] - [Device Display Interaction][display-guide] - [Event Notification Services][events-guide] - [Abort Transaction][abort-guide] - [Query Transaction States][status-guide] ### API Reference - [Financial Transaction Capabilities](#financial-capabilities) - [Device Interaction Capabilities](#device-capabilities) - [Transaction Support Capabilities](#transaction-support) ### Testing and Troubleshooting - [Go-Live Checklist][validation] - [Error Codes][errors] - [FAQ][faq] - [Developer Resources][resources] ### AI-Assisted Development - [Building with AI][building-with-ai] [introduction]: doc-id:53d855b2 [semi-overview]: doc-id:8d54626a [solution]: doc-id:609b68d5 [terminal-preparation]: doc-id:a5593d35 [dependency]: doc-id:bc7a173f [initialization]: doc-id:bc7a173f#ios-sdk-initialization [terminal-selection]: doc-id:358d4159 [service-routing]: doc-id:b6647a94 [payment-guide]: doc-id:d047ba5c [display-guide]: doc-id:afad6b34 [events-guide]: doc-id:818d1b32 [abort-guide]: doc-id:5011e2c5 [status-guide]: doc-id:c0b63f10 [financial-overview]: doc-id:2b18ebc9 [payment]: doc-id:789ff18e [refund]: doc-id:07b40203 [reversal]: doc-id:660431ac [preauth]: doc-id:96cf58b6 [completion]: doc-id:e9ac29b1 [adjustment]: doc-id:6652497a [reconciliation]: doc-id:5173f468 [balance]: doc-id:9b591236 [display]: doc-id:8d04a5ed [print]: doc-id:70b0cb0a [nfc]: doc-id:613f3351 [transmit]: doc-id:7e1aac94 [abort-api]: doc-id:0963eff1 [status-api]: doc-id:677a5c7f [events-api]: doc-id:12338768 [reprint]: doc-id:e5665e06 [validation]: doc-id:442040f5 [errors]: doc-id:27dda32e [faq]: doc-id:350ba5c5 [resources]: doc-id:d38c2ed5 [building-with-ai]: doc-id:1f5a7655