Checkout prefilling

You can prefill the checkout with parameters in the query string of the campaign URL: personal details, amount, frequency and more. It works both when opening the URL directly and with the Donation Button.

Supported parameters

Parameter	Type	Description
amount	decimal	Preselected amount (e.g. 25.00)
frequency	integer	Frequency: 0 = one-time, 12 = monthly
legal_person	string	Type of person: INDIVIDUAL or COMPANY
first_name	string	First name
last_name	string	Last name
email	string	Email address
phone	string	Phone
mobile	string	Mobile
business_name	string	Company name (for legal entities)
ssn	string	Tax code
vat	string	VAT number
address	string	Address
city	string	City
locality	string	Province / locality
postal_code	string	Postal code
country	string	Country
supporter_id	integer	ID of an existing supporter
cost_example	UUID	ID of a preselected cost example
cost_example_quantity	integer	Quantity for the cost example (greater than 0)
tags[]	array	Tags to associate with the checkout (tags[]=a&tags[]=b)
cf[<key>]	depends on the field	Value of a custom field (cf[codice-evento]=ABC)

Custom fields

To prefill a custom field use cf[<key>], where the key is the one shown in Settings > Custom fields. It works for both donation and supporter fields.

Field type	Accepted values
Text	any text
Boolean	true, 1, yes or false, 0, no
Date	YYYY-MM-DD format (e.g. 2026-10-16)
Select	one of the field options, written exactly as defined

An invalid value or an unknown key is ignored: the checkout still opens, without that field. The value is stored even when the field is not shown in the campaign, so you can use a hidden field to track the source.

https://tua-org.riseact.site/campaigns/nome-campagna/donate?amount=25&cf[codice-evento]=ABC&cf[newsletter-cartacea]=true

note

If supporter_id is set, the personal fields (legal_person, first_name, last_name, email, phone, mobile, business_name, ssn, vat, address, address2, city, locality, postal_code, country) and the supporter custom fields are ignored. Donation custom fields still apply.

Web checkout

https://tua-org.riseact.site/campaigns/nome-campagna/donate?email=mario.rossi@esempio.it&first_name=Mario&amount=25&frequency=0

Donation Button

<script>
  (window.riseactDonateBtns = window.riseactDonateBtns || []).push({
    checkoutUrl: "https://tua-org.riseact.site/campaigns/nome-campagna/donate?email=mario.rossi@esempio.it&first_name=Mario&amount=25&frequency=0"
  })
</script>