Circle V2 API Docs
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    programMembersInputSchema: ZodObject<
        {
            facilityId: ZodPipe<ZodString, ZodTransform<FacilityId, string>> & {
                innerType: () => ZodString;
            };
            facilityProgramId: ZodNullable<
                ZodPipe<ZodString, ZodTransform<FacilityProgramId, string>> & {
                    innerType: () => ZodString;
                },
            >;
        },
        $strip,
    > = ...

    facilityProgramId: null selects the derived "No program on file" row.