first commit

Interfaces/Services/ITimeBankCardService.cs

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+using Microsoft.AspNetCore.Http;
+
+namespace Fitness_core_BE.Interfaces.Services
+{
+    public interface ITimeBankCardService
+    {
+        /// <summary>Staff issues/sells a card -- minutes purchased, optionally linked to a member.</summary>
+        Task<object> IssueCard(object payload, HttpContext httpContext);
+
+        /// <summary>The tap-in/tap-out swipe action: first swipe on a card starts its session
+        /// (no deduction), second swipe ends it and deducts the elapsed minutes. No login
+        /// required (called by the reader/agent, or by staff at a manual terminal).</summary>
+        Task<object> Swipe(object payload);
+
+        Task<object> GetBalance(object payload);
+        Task<object> GetMyCards(object payload, HttpContext httpContext);
+    }
+}