# References {#en_directory}

A section with the glossary and the reference information relevant to working with the platform.

This section includes the glossary of terms used in the documentation and the reference information about the language and currency codes,the identifiers of payment methods supported in the Payment Page and Dashboard interfaces, the countryand region codes, and the Electronic Commerce Indicators.

-   [Glossary](en_glossary.md)
-   [Language codes](en_language_codes.md)
-   [Currency codes](en_currency_codes.md)
-   [Payment method codes](en_pm_codes.md)
-   [Payment card codes](en_card_codes.md)
-   [Country codes](en_country_codes.md)
-   [Region codes for card payments](en_region_codes.md)
-   [Test cards](en_test_cards.md)
-   [Electronic Commerce Indicators](en_ECI_codes.md)

-   **[Glossary](en_glossary.md)**  
A glossary of terms used in the platform and the documentation.
-   **[Language codes](en_language_codes.md)**  
A reference with the language codes in the alpha-2 format of the ISO 639 standard.
-   **[Currency codes](en_currency_codes.md)**  
A reference with the currency codes in the alpha-3 format of the ISO 4217 standard.
-   **[Payment method codes](en_pm_codes.md)**  
A reference with the internal codes of supported payment methods relevant to working with different interfaces of the platform.
-   **[Payment card codes](en_card_codes.md)**  
A reference with the internal codes indicating the payment card brands that can be used for working with the platform.
-   **[Country codes](en_country_codes.md)**  
A reference with the country codes in the alpha-2 format of the ISO 3166-1 standard.
-   **[Region codes for card payments](en_region_codes.md)**  
A reference with the region codes used in processing Mastercard and Visa payments via Ecommpay.
-   **[Test cards](en_test_cards.md)**  
A reference with card numbers that can be used for testing different card payment scenarios.
-   **[Electronic Commerce Indicators](en_ECI_codes.md)**  
A reference with the Electronic Commerce Indicators used by different card networks to communicate the results of the 3‑D Secure authentication of customers.