Update src/streamlit_app.py

src/streamlit_app.py

@@ -28,7 +28,92 @@ from streamlit_extras.stylable_container import stylable_container
 
 
 
+# --- 1. Email Input Form (NEW) ---
+# Use a form to capture the email and store it in session state
+with st.form(key='upgrade_form'):
+    # This is where the user writes their email address
+    user_email_input = st.text_input(
+        "Enter your email address to confirm your subscription and access the premium app:",
+        placeholder="your.email@example.com"
+    )
+    
+    # We use a submit button to generate the final link dynamically
+    submit_button = st.form_submit_button(label='Generate PayPal Link')
+
+    # Store the email in session state after submission
+    if submit_button and user_email_input:
+        st.session_state['user_email'] = user_email_input
+    elif submit_button and not user_email_input:
+        st.error("Please enter your email address to continue.")
+        st.session_state['user_email'] = None
+
+
+# --- 2. Payment Variables & Link Generation ---
+
+# Retrieve the captured email, defaulting to a placeholder if not set
+USER_EMAIL = st.session_state.get('user_email', 'placeholder@example.com')
+
+# !!! CRITICAL 1: Replace this placeholder with your actual PayPal email or Merchant ID. !!!
+PAYPAL_BUSINESS_EMAIL = "maria.tsilimos@proton.me"
+CURRENCY_CODE = "USD"
+
+# !!! CRITICAL 2: Base URL for the premium app.
+BASE_SUCCESS_URL = "https://premium-6msh.onrender.com"
+ 
+FIXED_AMOUNT = 29.90
+FIXED_ITEM_NAME = "Premium Annual Subscription"
+ITEM_NAME = FIXED_ITEM_NAME
+AMOUNT = FIXED_AMOUNT
+ 
+# 🔑 Generate the success URL with the captured email as a query parameter
+# The email is URL-encoded automatically by f-string, but we must use the captured variable
+SUCCESS_URL_WITH_EMAIL = f"{BASE_SUCCESS_URL}?user_email={USER_EMAIL}"
+
+PAYMENT_LINK = (
+    f"https://www.paypal.com/cgi-bin/webscr?"
+    f"cmd=_xclick&"
+    f"business={PAYPAL_BUSINESS_EMAIL}&"
+    f"item_name={ITEM_NAME}&"
+    f"amount={AMOUNT:.2f}&"
+    f"currency_code={CURRENCY_CODE}&"
+    f"return={SUCCESS_URL_WITH_EMAIL}" # 🔑 Now passes the dynamic email
+)
+ 
+# --- 3. HTML for the Button (Only displayed if email is ready) ---
+
+if USER_EMAIL and USER_EMAIL != 'placeholder@example.com':
+    
+    paypal_html = f"""
+    <div style="margin-top: 10px; text-align: center;">
+        <a href="{PAYMENT_LINK}" target="_blank"
+        style="
+            display: inline-block;
+            padding: 12px 24px;
+            font-size: 18px;
+            font-weight: bold;
+            color: black !important;
+            background-color: #FFC439; /* Yellow color */
+            border-radius: 8px;
+            text-align: center;
+            text-decoration: none;
+            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
+            transition: background-color 0.1s;
+        " onmouseover="this.style.backgroundColor='#FFAA00'"
+        onmouseout="this.style.backgroundColor='#FFC439'">
+            PAY NOW: Upgrade to Premium (${AMOUNT:.2f}/a year)
+        </a>
+    </div>
+    """
+
+    st.markdown("---")
+    st.markdown(paypal_html, unsafe_allow_html=True)
+    st.info(f"Click the button above to pay. You will be redirected to PayPal using the email: **{USER_EMAIL}**")
+
+else:
+    st.info("Please enter your email above and click 'Generate PayPal Link' to proceed with payment.")
 
+st.markdown("---")
+st.write("Thank you for using our free features!")