I am customizing the checkout page on PayPal.

To provide a logo and header image they require a URL that links directly to the image of the logo or header image such as <https://some.domain.name/logo.png>. I have to enter this URL on PayPal's website so that it can grab the image from my website to put on their checkout form.

I've tried placing the logo under the public directory and providing the URL: `https://some.domain.name/logo.png`

But this just gives a no route error.

How can I do this in Rails?