Submit Type is an add-on for the Stripe Checkout plugin that can be used to customize the type of the submit button that appears on the Stripe payment page. This allows you to show a different button text on a per product basis such as “Book”, “Donate” or “Pay”.
How Submit Type with Stripe Works
Stripe offers 4 different submit types to customize the text that appears on the payment page button – pay, book, donate and auto.
Submit Button Type Pay

Submit Button Type Book

Submit Button Type Donate

Submit Button Type Auto

How to Customize Stripe Submit Type
If you are using the “wp_stripe_checkout_session” shortcode in the Stripe Checkout plugin, you can change it to the following to customize the submit type.
[wp_stripe_checkout_session name="My Product" price="2.99" submit_type="donate"]
Supported values are: book, donate, pay and auto. The default is auto.
Get the Submit Type Add-on
WP Stripe Checkout Submit Type
Customize the type of the submit button that appears on the Stripe payment page.
License: Unlimited Websites
Note:
* Do not purchase before setting up the core plugin first. The add-on is not at fault if the core plugin does not work on your website.
* Do not purchase if you are not sure about a feature, contact us instead.
* Do not purchase to ask for more features or make the product work in a certain way.
Price: $39.99
What does the donate type do?
@Brian, When this is set, Stripe should classify the transaction as a donation.