# When using a redirect, we must pass back a to the redirect in order to correctly capture the u \[...\]

**URL:** <https://community.surveysparrow.com/t/when-using-a-redirect-we-must-pass-back-a-to-the-redirect-in-order-to-correctly-capture-the-u/1370>\
**Category:** Customer Experience (All Surveys)\
**Created:** [May 21, 2021, 5:44pm UTC](https://community.surveysparrow.com/t/when-using-a-redirect-we-must-pass-back-a-to-the-redirect-in-order-to-correctly-capture-the-u/1370 "2021-05-21T17:44:23Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![naia\_simon](https://avatars.discourse-cdn.com/v4/letter/n/35a633/32.png) [@naia\_simon](https://community.surveysparrow.com/u/naia_simon)\
**Post date:** [May 21, 2021, 5:44pm UTC](https://community.surveysparrow.com/t/when-using-a-redirect-we-must-pass-back-a-to-the-redirect-in-order-to-correctly-capture-the-u/1370/1 "2021-05-21T17:44:23Z")

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When using a redirect, we must pass back a to the redirect in order to correctly capture the unique respondent ID from a the respondent list.

The Survey URL should indicate placeholder variable  
Survey URL should contain an equal sign before the unique identifier (example below)  
http://survey.euro.confirmit.com/wix/p180000000000.aspx?ref=XXXX  
Unique identifier will be appended to the end of the survey URL. It is XXXX that must be added to the redirect link to identify the respondent. How do we do this?

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**Author:** ![hanan](https://avatars.discourse-cdn.com/v4/letter/h/b77776/32.png) [@hanan](https://community.surveysparrow.com/u/hanan)\
**Post date:** [May 26, 2021, 5:56am UTC](https://community.surveysparrow.com/t/when-using-a-redirect-we-must-pass-back-a-to-the-redirect-in-order-to-correctly-capture-the-u/1370/2 "2021-05-26T05:56:27Z")

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Hello Naia,

You may refer to this article here on Custom Variables please : https://community.surveysparrow.com/post/custom-variables-5dec9c0cc6aeb61fa4923065

Hope that helps!