fix: serialize Stripe checkout provisioning

src/config.rs

@@ -25,6 +25,7 @@ pub struct Config {
 
     pub stripe_secret_key: Option<String>,
     pub stripe_webhook_secret: Option<String>,
+    pub stripe_api_base_url: String,
 
     pub storage_path: String,
 
@@ -99,6 +100,10 @@ impl Config {
         }
         let stripe_secret_key = env_string("STRIPE_SECRET_KEY");
         let stripe_webhook_secret = env_string("STRIPE_WEBHOOK_SECRET");
+        let stripe_api_base_url = env_string("STRIPE_API_BASE_URL")
+            .unwrap_or_else(|| "https://api.stripe.com".to_string())
+            .trim_end_matches('/')
+            .to_string();
 
         let storage_path = env_string("STORAGE_PATH").unwrap_or_else(|| "./uploads".to_string());
 
@@ -140,6 +145,7 @@ impl Config {
             api_key_pepper,
             stripe_secret_key,
             stripe_webhook_secret,
+            stripe_api_base_url,
             storage_path,
             allow_anonymous_upload,
             anon_max_file_size_mb,

src/services/idempotency.rs

@@ -3,7 +3,6 @@ use crate::state::AppState;
 
 use chrono::{DateTime, Duration, Utc};
 use serde_json::Value as JsonValue;
-use sha2::{Digest, Sha256};
 use sqlx::FromRow;
 use uuid::Uuid;
 
@@ -27,15 +26,6 @@ struct IdemRow {
     response_body: Option<JsonValue>,
 }
 
-pub fn sha256_hex(parts: &[&[u8]]) -> String {
-    let mut hasher = Sha256::new();
-    for p in parts {
-        hasher.update(p);
-        hasher.update([0u8]); // separator
-    }
-    hex::encode(hasher.finalize())
-}
-
 pub async fn begin(
     state: &AppState,
     scope: Scope,