Add full project files

models/IsPaymentCourseModel.js

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+const mongoose = require("mongoose");
+const timestamp = require("mongoose-timestamp");
+const mongoosePaginate = require("mongoose-paginate-v2");
+
+const modelSchema = new mongoose.Schema({
+    user_id: { type: mongoose.Schema.Types.ObjectId, ref: "User", required: true },
+    course_id: { type: mongoose.Schema.Types.ObjectId, ref: "Course", required: true },
+    price_paid: { type: Number, required: true }, // قیمت پرداخت شده
+    purchased_at: { type: Date, default: Date.now },
+});
+
+modelSchema.plugin(timestamp);
+modelSchema.plugin(mongoosePaginate);
+const PostModel = mongoose.model("IsPaymentCourse", modelSchema);
+module.exports = PostModel;