How can I implement a secure CSP directive that includes the Stripe script without using 'unsafe-inline'?

Every time a page is served, ensure you create a new random nonce that you'll use in your CSP header. It should look like this: `Content-Security-Policy: script-src 'nonce-uniqueNonceValue';`. You'll need to use this same value in your inline scripts too, so format it like this in your HTML: `...`. Make sure you generate this nonce server-side and inject it into your response correctly. This method helps keep your application safe since a guessed nonce won’t work on other requests. Adapt the specifics based on your framework; for example, since you're using Deno and Fresh, make sure you're setting this correctly in your server responses! Good luck!

Using a nonce is a great idea for allowing scripts while still keeping your CSP tight! Basically, you'll want to generate a random nonce for each request. This nonce will be added to your CSP header, like this: `Content-Security-Policy: script-src 'nonce-yourRandomNonceHere'`. You also need to add the same nonce as an attribute in your script tags, like so: `...`. Just keep in mind that the nonce needs to be completely random and unique for each request; if someone tries to reuse it, it won't work since the value will change each time. Also, MDN has a solid guide on this topic if you need more detailed info! By the way, configuring third-party scripts can be a challenge. I dealt with a lot of weird errors from injected scripts before implementing CSP, so it’s really worth the effort!