@cfxlabsinc/b2b-services
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    TSmsTestSendRequest: TObject<
        {
            idempotencyKey: TString;
            kind: TLiteral<"smsTemplateTestSend">;
            phoneNumber: TString;
            renderCase: TObject<
                {
                    axes: TRecord<"^.*$", TUnion<[TLiteral<"true">, TLiteral<"false">]>>;
                    optionalVariables: TUnion<[TLiteral<"present">, TLiteral<"absent">]>;
                },
            >;
            templateVersionId: TString;
        },
    > = ...

    The handler's check of an invoke payload before it acts on it.