How can I add an optional donation to a customer's cart?

Hi @Mark0601 ,

Thank you for reaching out to the Community! I’m happy to provide some assistance with locating a donation app for customers, to ensure this gets resolved.

To successfully achieve this, I recommend checking out the Shopify App Store. We have various apps available that may allow you to complete this. For ease, I’ve gone ahead and made a few suggestions listed below that you can look into:

As you are looking for an app with specific features, I’d recommend getting in touch with the app developers directly. They will be able to provide clarification on an app’s capabilities and customizations to confirm whether or not the app will fit your shop’s needs. To get in contact with an app developer, you can head to the Shopify App Store and select Support > Send A Message.

Please let me know if you have any other questions or concerns.