rename stripe_api_key to stripe_whsec_key

.env

@@ -1,2 +1 @@
 DATABASE_URL=mysql://root:dev_web3_proxy@127.0.0.1:13306/dev_web3_proxy
-STRIPE_API_KEY=

web3_proxy/src/config.rs

@@ -168,8 +168,8 @@ pub struct AppConfig {
     /// Optionally send errors to <https://sentry.io>
     pub sentry_url: Option<Dsn>,
 
-    /// Stripe api key from environment variable,
-    pub stripe_api_key: Option<String>,
+    /// Stripe api key for checking validity of webhooks
+    pub stripe_whsec_key: Option<String>,
 
     /// Track rate limits in a redis (or compatible backend)
     /// It is okay if this data is lost.

web3_proxy/src/frontend/users/payment_stripe.rs

@@ -87,7 +87,7 @@ pub async fn user_balance_stripe_post(
 
     let secret = app
         .config
-        .stripe_api_key
+        .stripe_whsec_key
         .clone()
         .web3_context("Stripe API key not found in config!")?;