Support POST /create-payment-intent

Interact with Stripe's payment_intents API endpoint.

I'm not committing the index.html that contains client-side code that interacts
with the /create-payment-intent endpoint, but it contains sensitive information,
so I'm omitting it for now.

TL;DR:
- Define POST /create-payment-intent endpoint
- Include envStripeAPIKey in Context record
- Define a top-level Stripe module for making API calls
- Define types and instances that align with Stripes request and response types
- Depend on the Req library: a higher-level library than http-client

1 files changed, 1 insertions, 0 deletions

diff --git a/website/sandbox/learnpianochords/src/server/default.nix b/website/sandbox/learnpianochords/src/server/default.nix
index 4efe1183d16a..6ed68d4417f4 100644
--- a/website/sandbox/learnpianochords/src/server/default.nix
+++ b/website/sandbox/learnpianochords/src/server/default.nix
@@ -23,5 +23,6 @@ in briefcase.buildHaskell.program {
     http-conduit
     rio
     envy
+    req
   ];
 }