"SendOwl has enabled us to grant ownership over digital products to our users, which we were able to take a step further by using SendOwl to act as the link between our Shopify web store and custom Tone Shop API. Now we can sell digital products as in-app purchases as well as through our website, and the webhooks enable linking of product ownership via the customer's email. And we are also planning on using this for the launch of Tone Shop desktop plugins!"