tagResource

// Adds tags to a resource
val resp = rtbFabricClient.tagResource {
    resourceArn = "arn:aws:rtbfabric:us-east-1:123456789012:gateway/rtb-gw-12345678"
    tags = mapOf<String, String>(
        "Environment" to "Production",
        "Team" to "RTB"
    )
}