Hi,
Thank you for reaching out to the Google Ads API support team.
Kindly note that the gclid is optional for
enhanced conversions for leads if you use the user identifier. Also, populate the user_identifiers with the normalized and hashed lead data. If you have multiple user identifiers available, create a separate UserIdentifier for each one, up to five identifiers.
You can change the conversionDateTime, hashed emails for the same conversion which will be considered as a different value. Refer to the
usage flow for more information.