key
TypeScriptget key(): stringSwift declarationlet key: StringThe key for the custom header.
struct · iOS 26.0+ · SDK 27.1
struct MMSCustomHeaderA structure that defines a custom header as a key-value pair. TelephonyMessagingKit exposes custom headers in case a message needs to include them in an MMS message.
get key(): stringSwift declarationlet key: StringThe key for the custom header.
get value(): stringSwift declarationlet value: StringThe value of the custom header.
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