Create app.py

app.py

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+import streamlit as st
+import random
+from faker import Faker
+from datetime import datetime, timedelta
+
+fake = Faker()
+
+# ---------------- UI CONFIG ----------------
+st.set_page_config(
+    page_title="Credit Card Generator",
+    layout="centered",
+    initial_sidebar_state="collapsed"
+)
+
+# ---- Dark Mode Styling ----
+st.markdown("""
+<style>
+body {
+    background-color: #0e1117;
+    color: #ffffff;
+}
+.stButton>button {
+    background-color: #4CAF50;
+    color: white;
+    border-radius: 8px;
+    height: 3em;
+    width: 100%;
+}
+.card-box {
+    background: linear-gradient(135deg, #1f2937, #111827);
+    padding: 20px;
+    border-radius: 12px;
+    color: white;
+    font-family: monospace;
+}
+.copy-btn {
+    margin-top: 10px;
+}
+</style>
+""", unsafe_allow_html=True)
+
+st.title("💳 Credit Card Generator")
+
+st.caption("Generate **test credit card details** for development and QA use only.")
+
+# ---------------- INPUT ----------------
+card_type = st.selectbox("Select Card Type", ["VISA", "MASTERCARD"])
+generate = st.button("Generate Card")
+
+# ---------------- CORE LOGIC ----------------
+
+def luhn_generate(prefix, length):
+    number = prefix
+    while len(number) < length - 1:
+        number += str(random.randint(0, 9))
+
+    digits = [int(d) for d in number]
+
+    for i in range(len(digits) - 1, -1, -2):
+        digits[i] *= 2
+        if digits[i] > 9:
+            digits[i] -= 9
+
+    checksum = (10 - (sum(digits) % 10)) % 10
+    return number + str(checksum)
+
+def format_card(number):
+    return " ".join([number[i:i+4] for i in range(0, len(number), 4)])
+
+def generate_expiry():
+    future_date = datetime.now() + timedelta(days=random.randint(365, 1825))
+    return future_date.strftime("%m/%y")
+
+def generate_cvv():
+    return str(random.randint(100, 999))
+
+def detect_country(bin_prefix):
+    bin_map = {
+        "4": "USA / International (VISA)",
+        "51": "USA (MasterCard)",
+        "52": "Canada",
+        "53": "UK",
+        "54": "Germany",
+        "55": "France"
+    }
+    return bin_map.get(bin_prefix[:2], "Unknown")
+
+def generate_card(card_type):
+    if card_type == "VISA":
+        prefix = "4"
+        length = 16
+    else:
+        prefix = str(random.choice(range(51, 56)))
+        length = 16
+
+    number = luhn_generate(prefix, length)
+
+    return {
+        "number": number,
+        "formatted": format_card(number),
+        "name": fake.name(),
+        "zip": fake.zipcode(),
+        "expiry": generate_expiry(),
+        "cvv": generate_cvv(),
+        "country": detect_country(prefix)
+    }
+
+# ---------------- OUTPUT ----------------
+
+if generate:
+    card = generate_card(card_type)
+
+    st.success("Card Generated")
+
+    st.markdown(f"""
+    <div class="card-box">
+        <h3>{card_type}</h3>
+        <p style="font-size:20px;">{card['formatted']}</p>
+        <p>{card['name']}</p>
+        <p>EXP: {card['expiry']} | CVV: {card['cvv']}</p>
+    </div>
+    """, unsafe_allow_html=True)
+
+    st.write(f"**ZIP Code:** {card['zip']}")
+    st.write(f"**Country (BIN):** {card['country']}")
+
+    # -------- Copy Buttons --------
+    st.subheader("Copy Details")
+
+    st.code(card["number"], language="text")
+    st.code(card["formatted"], language="text")
+    st.code(card["cvv"], language="text")
+
+    st.info("⚠️ These are fake/generated details for testing only. Not usable for real transactions.")