Circle V2 API Docs
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    Variable chartPreprocessingSignatureSchemaConst

    chartPreprocessingSignatureSchema: ZodObject<
        {
            role: ZodNullable<ZodString>;
            signedAt: ZodNullable<ZodString>;
            signer: ZodNullable<ZodString>;
        },
        $strip,
    > = ...

    One signature on the document. Mirrors ExtractedSignature from @repo/legacy/integrations/signatures without its raw field, which is the whole vendor entry the signature was read from and would put a second copy of chart payload into jsonb on every signed chart.