Added README for Subscription Fee SC

subscription-fee/README.md

@@ -0,0 +1,31 @@
+# Subscription Fee Smart Contract
+
+The Smart Contract provides a comprehensive set of functionalities for managing subscription services and fees on the MultiversX blockchain. It allows users to register services, subscribe to services, deposit funds, withdraw funds, and perform various other actions related to managing subscription services and fees.
+
+The code consists of multiple modules and endpoints that handle various operations related to subscription services, fees, pair actions, among others.
+
+Let's break down the key components and functionalities of the Smart Contract:
+
+## Initialization
+
+Defines the initialization function for setting up the SC with the mandatory variables.
+
+## Service Module
+
+Manages the registration, approval, and subscription of services. It also defines the structure of a service, including payment information and subscription epochs. The module allows the service provider to register or add extra services, unregister services, and the users to subscribe/unsubscribe to/from those said services.
+
+## Fees Module
+
+Handles the addition of accepted fee tokens, setting minimum deposit values, user deposits, and fund withdrawals.
+
+## Common Storage Module
+
+Contains storage mappers and views for various data storage and retrieval operations used by other modules.
+
+## Pair Actions Module
+
+Deals with pair related operations and price queries. Provides functions for adding/removing pair addresses and retrieving token prices.
+
+## Subtract Payments Module
+
+Handles the subtraction of payments for subscribed services. Uses a custom result type for successful or failed price queries, to have a more flexible code output.

subscription-fee/src/lib.rs

@@ -52,4 +52,7 @@ pub trait SubscriptionFee:
             .set_if_empty(min_stable_token_deposit_value);
         self.add_accepted_fees_tokens(accepted_tokens);
     }
+
+    #[upgrade]
+    fn upgrade(&self) {}
 }

subscription-fee/wasm/src/lib.rs

@@ -5,9 +5,9 @@
 ////////////////////////////////////////////////////
 
 // Init:                                 1
-// Endpoints:                           20
+// Endpoints:                           21
 // Async Callback (empty):               1
-// Total number of exported functions:  22
+// Total number of exported functions:  23
 
 #![no_std]
 
@@ -22,6 +22,7 @@ multiversx_sc_wasm_adapter::endpoints! {
     subscription_fee
     (
         init => init
+        upgrade => upgrade
         addAcceptedFeesTokens => add_accepted_fees_tokens
         setMinDepositValue => set_min_deposit_value
         deposit => deposit