Optionallanguage_The BCP-47 language code, such as en-US or sr-Latn. For more information, see http://www.unicode.org/reports/tr35/#Unicode_locale_identifier. English is the default language_code.
OptionalparametersRequired if the template has parameters. Concrete values must be present for all defined parameters in the template. Parameters can be different for different versions and/or languages of the template.
The ID of the template.
Used to specify what version of a template to use. This will be used in conjunction with language_code.
The referenced template can be an omnichannel template stored in Conversation API Template Store as AppMessage or it can reference external channel-specific template such as WhatsApp Business Template.