apInitiateService_languageInterface {#ap-initiate-service-language-interface}
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Specifies the language used to communicate with the user.  
The value must follow the format:  
Language code: ISO 639‑1 (two letters, lowercase) - Underscore (_) - Country code: ISO 3166‑1 alpha‑2 (two letters, uppercase)  
The language and country codes must be separated by an underscore (_). For example, example: `en_US`.  
For the Korea Cyber Payment (KCP) service, the default value is `Korean`.  
Possible values:

* `EN`: English
* `Korean`: Korean

Specifications {#ap-initiate-service-language-interface_d1631e55}
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* **Data Type:** String
* **Data Length:** 6

Mapping Information {#ap-initiate-service-language-interface_d1631e74}
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* **REST API Field:** buyerInformation.language
* **SCMP API Field:** ap_initiate_language_interface
* **Simple Order API Field:** apInitiateService_languageInterface