> For the complete documentation index, see [llms.txt](https://sandbox-docs.verifone.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sandbox-docs.verifone.com/adk-5.0-programmers-guide/readme/adk_programming_interfaces.md).

# ADK Programming Interfaces

* **Card Reading and Transactions**
  * [Card Acceptance and Technology Selection](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_tec_programmers_guide.md)
  * [Magnetic Stripe Reading](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_msr_programmers_guide.md)
  * [EMV Contact Cards](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_emv_contact_users_guide.md)
  * [EMV Contactless Cards](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_emv_contactless_users_guide.md)
  * [Synchronous Cards](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_crdsync_programmers_guide.md)
  * [NFC Cards and Wallets](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_nfc_users_guide.md)
  * [ISO8583 Message Packing](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_iso8583_users_guide.md)
* **User Interaction**
  * [User Interface](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_gui_users_guide.md)
  * [Receipt Printing](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_printer_users_guide.md)
  * [Sound Output](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_sound_users_guide.md)
  * [Finger Print Sensor (externally USB connected)](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_fps_users_guide.md)
  * [Preventing Image Persistence](/adk-5.0-programmers-guide/readme/developing_applications/pg_adk_application_notes/pg_preventing_image_persistence.md)
  * [Touchscreen Usage Rules](/adk-5.0-programmers-guide/readme/pg_system_diagnosis_and_troubleshooting/pg_touchscreen_tips.md)
* **Security Functions**
  * [Security Service](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_sec_users_guide.md)
  * [Key Management](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_sec_users_guide.md#subsubsec_security_key_management)
  * [PIN Processing](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_sec_users_guide.md#subsubsec_security_pin_handling)
  * [SRED Data Encryption (ADE, VCL)](/adk-5.0-programmers-guide/readme/modules/group___config.md#sred)
  * [Verifone Structure Script (VSS)](/adk-5.0-programmers-guide/readme/adk_programming_interfaces/pg_vss_documentation.md)
  * [Verifone Remote Keys injection Agent (VRK)](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_vrk_agt_users_guide.md)
  * [Security Control Panel (SCP)](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_scp_users_guide.md)
* **Communication Functions**
  * [Communication Control Panel (CCP)](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_ccp_users_guide.md)
  * [Communication Library](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_com_users_guide.md)
  * [Inter-Process-Communication](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_ipc_users_guide.md)
* **Application Management**
  * [Secure Installer](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_vos_secins_guide.md)
  * [Multi-Application Control](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_mac_users_guide.md)
  * [VHQ Agent](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_agt_users_guide.md)
* **System Functions and Utilities**
  * [Power Management](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_syspm_users_guide.md)
    * [Application Note](/adk-5.0-programmers-guide/readme/developing_applications/pg_adk_application_notes/pg_pm_app_notes.md)
  * [System Information](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_sysinfo_users_guide.md)
  * [Logging](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_logging_users_guide.md)
  * [Information Database and Utilities](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_inf_users_guide.md)
  * [Data Parsing: XML, JSON, INI, Regex](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_expat_users_guide.md)
  * [Event Framework (Deprecated)](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_evt_users_guide.md)
  * [Multi-Drop Bus Protocol (MDB) API](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_mdb_users_guide.md)
  * [Interface to external GPIO](/adk-5.0-programmers-guide/readme/system_overview/pg_all_components/pg_gpio_users_guide.md)


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