When respondents participate in your survey or form they are assigned with the unique system identifiers which can be retrieved by means of "Respondent ID Saver" plugin.
Create new or use existing question of Single Line type as a holder for the respondent ID and then reference to this question using the following parameter:
- *Respondent ID Question Reference - Use Qx.Ay format, where:
x - question number;
y - answer choice number.
You can also reference to a Multiline type of question using the Qx.A1 notation as this type of question proposes only one answer choice and to the Comment field of the Pick One or Other type of question using the Qx.Ay notation.
Please note, that this plugin also works with question and answer identifiers, so you can use them instead of question and answer numbers in plugin parameters.