If you want to populate a custom field on your donation page with a parameter that is passed through the URL, here is how...
- Set up your custom field.
- Grab the custom field ID in the bottom corner when editing the custom field on an item.
3. You can then pass in a value for the field (what you want to be populated in the custom field) by adding the '?cf' prefix and the custom field ID to the URL, e.g. https://themeglobal.com/annualevent?cf116=11/12/2020
NB: When using Webhooks, add a "Hidden" custom field that's populated from the donation page URL to pass an external reference/user ID that will get included in the payload for the webhook.