updated Payment reconcillation code

Dockerfile

@@ -0,0 +1,18 @@
+# Use official Python image
+FROM python:3.9
+
+# Set working directory inside container
+WORKDIR /app
+
+# Copy all files to container
+COPY . .
+
+# Install dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Expose Flask's default port
+EXPOSE 5000
+
+# Run Flask app
+CMD ["python", "main.py"]
+