Prefill information in Checkout using URL parameters

Fundraise Up’s URL API allows you to pre-fill information in the Checkout modal, Campaign Page or Donation Form using URL parameters. This strategy works well if you are sending traffic to your site from an email marketing campaign and dynamically setting the value of parameters using merge tags.

You can use the URL API in conjunction with the Donate Link element to easily create customizable tracking links.

Available parameters

Parameter Description Example Format
firstName Supporter's first name. Dawes String
lastName Supporter's last name. Case String
email Supporter's email address. dawes.case@gmail.com String
amount Donation Amount. By default, Fundraise Up doesn't automatically accept donations with cents (or other fractional currency units). However, you can enable this feature by contacting your personal Customer Success Manager or our Support Team. Learn more → 150 Float
modifyAmount Disallow the supporter to modify the donation amount set by the URL parameter amount. To lock the donation amount so that supporters cannot alter it, include the modifyAmount=no parameter in addition to the amount parameter with the specified sum. For example: amount=20&modifyAmount=no. This parameter isn't applicable to the Donation Form. no String
currency Currency of the donation. You must specify the currency by its ISO 4217 alphabetic code (for example, currency=USD for the US dollar). The modifyAmount=no parameter also prohibits the donor from changing the currency value in the Checkout modal and Campaign page. USD String
recurring Sets the donation frequency. once String
designationId Sets a designation for the donation using the designation’s ID. EHHJ9R36 String
modifyDesignation Disallow the supporter to modify the designation set by the URL parameter, designationId. If the designation is hidden in the Donation Form settings, designations passed through the URL will not appear on the Donation Form. However, they will appear in the checkout when it is opened from the Donation Form. no String
tributeHonoree Sets the value for the tribute honoree. If the tribute is hidden in the Donation Form settings, tributes passed through the URL will not appear on the Donation Form. However, they will appear in the checkout when it is opened from the Donation Form. Mom and Dad String
successUrl Sets the redirect URL when a Thank you screen option in Checkout is set to “Redirect to URL”. This parameter isn't applicable to the Donation Form. View example String
elementKey Element's ID. This parameter specifies which Donation Form on your website should be automatically filled in. If no matching Donation Form ID is found on the page, all parameters will be disregarded. You can find the Elements ID in your Dashboard. XRHREBFG String
URL parameters are case-sensitive. Reference the table above for properly formatted parameter names.

Best practices

For most use cases, we recommend that you do not use parameters that contain personally identifiable information (PII). PII is any information that can be used to identify an individual, such as a name, address, phone number, or e-mail address.

If you use Google's marketing tools, such as Ads or Analytics, you should not use URL API parameters that contain PII, as this practice violates Google's policies. Learn more →


Below are two examples of URLs that have been appended with URL API parameters to pre-fill information in the Checkout form.

URL with PII

This example includes personally identifiable information such as the supporter’s first and last name, and their email address. Pre-filling this information streamlines the checkout process, but may affect compliance with your organization's or your service provider's privacy policies.

Donation Form


A link to a Donation Form with PII parameters in the URL.

PII submitted via URL will not be visible on the Donation Form, but will be displayed during checkout if accessed from the Donation Form.

Checkout modal


A link to a Checkout modal with PII parameters in the URL.

Campaign Page


A link to a Campaign Page with PII parameters in the URL.

URL with no PII

This is the same URL as the example above, but the parameters containing personally identifiable information have been removed. If you are using analytics or advertising products, this is the best way to implement the URL API.


In the examples above, the parameter, fundraiseupLivemode=no, has been appended to the URL. This allows you to use test mode to explore the areas of Checkout where the URL API has pre-filled information.


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