let more "fixed" parameters come first and then the dynamic ones so
that one can do currying with the immutable parameters applied.

Stripe developer dashboard provides a few keys and we specifically
need to use the secret key.

If for "some reason" Stripe servers returned a mismatched voucher
code, return http 500 status.

Mark the voucher as paid if the stripe charge API returns a Charge
object.

The skeleton is in place, a lot of actual work still needs to be done.

Fix the direct Nix build.

Supply the warp-tls dependency and add CircleCI coverage for direct Nix builds.

Support serving either HTTP or HTTPS

Get stack to compute the doc path correctly

Pass the same flags so the snapshot is computed the same so the paths match.

???

Okay what is it

`stack path --fast ...` says "Invalid option `--fast'"

From #haskell:

> that might change optimization and thereby the abi since cross-module
> inlining information will be absent with -O0 / no -O

privacypass Nix packaging is sensitive to the version and the one previously
selected is now too old

Initial implementation of persistence using SQLite3.