For our Shopify integration, we currently don't support a custom donation amount input directly. However, you can create variants for different donation amounts. This approach allows donors to choose from preset donation amounts. Here's an example of how you can implement variant options: Example with variant amount options.
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If you need more flexibility, consider using our standalone widget with Stripe integration, which functions outside of Shopify. This setup allows you to offer both preset and custom donation amounts. You can embed the widget on a dedicated page in your Shopify store. Check out this example to see how it can be done: Example.