>> Thanks for your reply.
>> I also use WestWind Client Tools for automated E-Mailing (have for years).
>> Which components are you using? Are you able to synchronize Data between VFP and Salesforce?
>
>IIRC, all you really need is wwJSonSerializer
>
>Syncing data back-and-forth using Json (via update/upserts) works like a charm. There's some finicky-ness with the way it treats empty dates. I think by default wwJsonSerializer passes an empty string (e.g. "') and Salesforce expects null. (I'm not sure if that's salesforce-wide or if it's just the instance I am working with.) I modified that section of WriteDate in wwJsonSerializer.prg so that it returns [null] instead of [""].

Thanks for the info Thomas - most helpful - will look into this.