How do I collect custom information from my customers?

When setting up your form, Senja set customer name as mandatory. You can set other details that you want to ask from your customers in easy steps.

Setup additional field in the form

• Go to your Forms page: https://app.senja.io/forms

• Go to the form, click the ⚙️ icon and choose Edit

  

• Go to Form tab and scroll down to About you page

• Click the ➕ sign on Additional Fields to add the custom field

  

• Choose the Type, update the Label, and choose if it's required or not

  

• Click Save when you're done

• Now the About you page has this custom field on screen

  

• You can do the same with About company page

Hidden fields

Hidden fields allow you to pass data into your form via URL parameters — perfect for use with automations like Zapier and webhooks.

For example, you can create a hidden field called user_id in your form. When sharing the form link, simply append the value in the URL like so: https://senja.io/p/senja/r/officehourslove?user_id=123

How to set up a hidden field

• Create an additional field in your form

• Mark the field as Hidden

  

• This ensures the field won’t be visible to users but will still capture any values passed through the URL

Match the parameter name to the field ID

The parameter name in the link must match the field’s ID exactly.

• The form editor can convert underscores in the field ID to hyphens

• Check the field ID in the editor before you build your link

  • For example, if your field ID is ck-subscriber-id, use ?ck-subscriber-id=VALUE

  • ?ck_subscriber_id=VALUE will not work

  • An underscore version is not treated as an alias of the hyphen version

• If you can’t change the parameter name on your side, rewrite it to the field ID before the form loads

• For example, do this in the page or integration that generates the form link

The field must exist in the form first. Adding a parameter to the link without a matching field in the form does not save or export anything.

Use one form for many events

If you reuse one form (for example, for different live events), create hidden fields such as an event name and an event ID, and give each event its own link:

• Event A: https://senja.io/p/your-project/r/FORMID?event-name=Event-A

• Event B: https://senja.io/p/your-project/r/FORMID?event-name=Event-B

Every submission keeps the event information, including testimonials that arrive days or weeks later.

Find the custom information in your export

Answers to your additional fields, including hidden fields, are saved on every testimonial. To see them:

• Go to your Proof page: https://app.senja.io/

• Export all testimonials to CSV

  

• Scroll to the last columns of the downloaded file. Your additional fields appear there (for example event__name, event__i_d, kit__subscriber__i_d).

• Filter or sort the sheet by the column you need, such as one event

What you can’t do yet

• Filter or search testimonials by a hidden field’s value inside Proof

• Automatically tag a testimonial based on a hidden field’s value. You can set a fixed tag on the form, but not one that changes with the value.

Workaround for automatic tagging

Use the testimonial_created webhook. It includes your hidden field values, and the API can add a tag to the testimonial with add_tags. See [REST API].

Troubleshooting