Additionally, we’ve added the ability to skip creating a new record if a matching record already exists using fields values as record identifiers, for improved performance.
For example, suppose you sent the following request for a user record:
<code>othersettings : {""uidfields"": ""sf_Phone;;cf_fieldintitle2"", ""noupdateifexist"":1}</code>
If the phone field (sf_Phone) and the custom field (cf_fieldintitle2) match a user record, the record will not be created. Update operations are not processed when using record identifiers.