Unable to write GCLID via UPSERT API call

We are trying to add the Google Adwords integration to our existing custom web forms, which requires us to write the GCLID value to the Leads we create.

All of our webforms use Zoho's UPSERT API, but it does not seem like this API is capable of writing the GCLID to the Leads module. I've reviewed previous threads about this topic, and it seems that we can only write to this field using the INSERT API. But the point of upsert is that it can do both in a single call, so it seems that in the event UPSERT is doing an INSERT, it would be logical for it to be able to write the GCLID to Zoho.

I'm not sure what my options are, short of replacing all our API upserts with a series of API calls (do an API search for existing record, and if a record is not found, call the INSERT API, if it is found, call the UPDATE API). We would have to do that for all of our webforms, which is a pretty substantial undertaking just to sync one new field.

I think it would make much more sense for Zoho to allow the API UPSERT to update this field when it is INSERTING a record. I would be okay if UPSERT was unable to write to the field if the call was updating an existing record.

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