feat: add full billing address collection to Stripe payment forms (refs #55)

- Replace CardElement with PaymentElement + AddressElement in subscription forms
- Add AddressElement to donation forms for billing address collection
- Now collects: Name, Address Line 1/2, City, State, Postal Code, Country
- Card details: Card Number, Expiration, CVC
- Both desktop and mobile forms updated

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/features/subscription/components/DonationSection.tsx

@@ -14,12 +14,12 @@ import {
   TableRow,
   Chip,
 } from '@mui/material';
-import { CardElement, useStripe, useElements } from '@stripe/react-stripe-js';
+import { CardElement, AddressElement, useStripe, useElements } from '@stripe/react-stripe-js';
 import { format } from 'date-fns';
 import toast from 'react-hot-toast';
 import { Card } from '../../../shared-minimal/components/Card';
 import { useCreateDonation, useDonations } from '../hooks/useSubscription';
-import type { StripeCardElementChangeEvent } from '@stripe/stripe-js';
+import type { StripeCardElementChangeEvent, StripeAddressElementChangeEvent } from '@stripe/stripe-js';
 import type { SubscriptionTier } from '../types/subscription.types';
 
 interface DonationSectionProps {
@@ -48,6 +48,7 @@ export const DonationSection: React.FC<DonationSectionProps> = ({ currentTier })
   const [error, setError] = useState<string | null>(null);
   const [processing, setProcessing] = useState(false);
   const [cardComplete, setCardComplete] = useState(false);
+  const [addressComplete, setAddressComplete] = useState(false);
   const [showSuccess, setShowSuccess] = useState(false);
 
   const createDonationMutation = useCreateDonation();
@@ -60,6 +61,10 @@ export const DonationSection: React.FC<DonationSectionProps> = ({ currentTier })
     setCardComplete(event.complete);
   };
 
+  const handleAddressChange = (event: StripeAddressElementChangeEvent) => {
+    setAddressComplete(event.complete);
+  };
+
   const handleSubmit = async (event: React.FormEvent) => {
     event.preventDefault();
 
@@ -72,6 +77,11 @@ export const DonationSection: React.FC<DonationSectionProps> = ({ currentTier })
       return;
     }
 
+    const addressElement = elements.getElement(AddressElement);
+    if (!addressElement) {
+      return;
+    }
+
     // Validate amount
     const amountNum = parseFloat(amount);
     if (isNaN(amountNum) || amountNum < 0.5) {
@@ -79,6 +89,13 @@ export const DonationSection: React.FC<DonationSectionProps> = ({ currentTier })
       return;
     }
 
+    // Get billing address data
+    const addressData = await addressElement.getValue();
+    if (!addressData.complete) {
+      setError('Please complete the billing address');
+      return;
+    }
+
     setProcessing(true);
     setError(null);
 
@@ -87,10 +104,21 @@ export const DonationSection: React.FC<DonationSectionProps> = ({ currentTier })
       const donationResponse = await createDonationMutation.mutateAsync(amountNum);
       const { clientSecret } = donationResponse.data;
 
-      // Confirm payment with Stripe
+      // Confirm payment with Stripe including billing details
       const { error: confirmError } = await stripe.confirmCardPayment(clientSecret, {
         payment_method: {
           card: cardElement,
+          billing_details: {
+            name: addressData.value.name,
+            address: {
+              line1: addressData.value.address.line1,
+              line2: addressData.value.address.line2 || undefined,
+              city: addressData.value.address.city,
+              state: addressData.value.address.state,
+              postal_code: addressData.value.address.postal_code,
+              country: addressData.value.address.country,
+            },
+          },
         },
       });
 
@@ -118,7 +146,7 @@ export const DonationSection: React.FC<DonationSectionProps> = ({ currentTier })
     }
   };
 
-  const isFormValid = amount && parseFloat(amount) >= 0.5 && cardComplete && !processing;
+  const isFormValid = amount && parseFloat(amount) >= 0.5 && cardComplete && addressComplete && !processing;
 
   return (
     <Card padding="lg">
@@ -164,6 +192,35 @@ export const DonationSection: React.FC<DonationSectionProps> = ({ currentTier })
           />
         </Box>
 
+        <Box sx={{ mb: 3 }}>
+          <Typography variant="subtitle2" gutterBottom>
+            Billing Address
+          </Typography>
+          <Box
+            sx={{
+              border: 1,
+              borderColor: 'divider',
+              borderRadius: 1,
+              p: 2,
+              '&:hover': {
+                borderColor: 'primary.main',
+              },
+            }}
+          >
+            <AddressElement
+              options={{
+                mode: 'billing',
+                defaultValues: {
+                  address: {
+                    country: 'US',
+                  },
+                },
+              }}
+              onChange={handleAddressChange}
+            />
+          </Box>
+        </Box>
+
         <Box sx={{ mb: 3 }}>
           <Typography variant="subtitle2" gutterBottom>
             Card Details

frontend/src/features/subscription/components/DonationSectionMobile.tsx

@@ -1,10 +1,10 @@
 import React, { useState } from 'react';
-import { CardElement, useStripe, useElements } from '@stripe/react-stripe-js';
+import { CardElement, AddressElement, useStripe, useElements } from '@stripe/react-stripe-js';
 import { format } from 'date-fns';
 import toast from 'react-hot-toast';
 import { GlassCard } from '../../../shared-minimal/components/mobile/GlassCard';
 import { useCreateDonation, useDonations } from '../hooks/useSubscription';
-import type { StripeCardElementChangeEvent } from '@stripe/stripe-js';
+import type { StripeCardElementChangeEvent, StripeAddressElementChangeEvent } from '@stripe/stripe-js';
 import type { SubscriptionTier } from '../types/subscription.types';
 
 interface DonationSectionMobileProps {
@@ -33,6 +33,7 @@ export const DonationSectionMobile: React.FC<DonationSectionMobileProps> = ({ cu
   const [error, setError] = useState<string | null>(null);
   const [processing, setProcessing] = useState(false);
   const [cardComplete, setCardComplete] = useState(false);
+  const [addressComplete, setAddressComplete] = useState(false);
   const [showSuccess, setShowSuccess] = useState(false);
 
   const createDonationMutation = useCreateDonation();
@@ -45,6 +46,10 @@ export const DonationSectionMobile: React.FC<DonationSectionMobileProps> = ({ cu
     setCardComplete(event.complete);
   };
 
+  const handleAddressChange = (event: StripeAddressElementChangeEvent) => {
+    setAddressComplete(event.complete);
+  };
+
   const handleSubmit = async (event: React.FormEvent) => {
     event.preventDefault();
 
@@ -57,6 +62,11 @@ export const DonationSectionMobile: React.FC<DonationSectionMobileProps> = ({ cu
       return;
     }
 
+    const addressElement = elements.getElement(AddressElement);
+    if (!addressElement) {
+      return;
+    }
+
     // Validate amount
     const amountNum = parseFloat(amount);
     if (isNaN(amountNum) || amountNum < 0.5) {
@@ -64,6 +74,13 @@ export const DonationSectionMobile: React.FC<DonationSectionMobileProps> = ({ cu
       return;
     }
 
+    // Get billing address data
+    const addressData = await addressElement.getValue();
+    if (!addressData.complete) {
+      setError('Please complete the billing address');
+      return;
+    }
+
     setProcessing(true);
     setError(null);
 
@@ -72,10 +89,21 @@ export const DonationSectionMobile: React.FC<DonationSectionMobileProps> = ({ cu
       const donationResponse = await createDonationMutation.mutateAsync(amountNum);
       const { clientSecret } = donationResponse.data;
 
-      // Confirm payment with Stripe
+      // Confirm payment with Stripe including billing details
       const { error: confirmError } = await stripe.confirmCardPayment(clientSecret, {
         payment_method: {
           card: cardElement,
+          billing_details: {
+            name: addressData.value.name,
+            address: {
+              line1: addressData.value.address.line1,
+              line2: addressData.value.address.line2 || undefined,
+              city: addressData.value.address.city,
+              state: addressData.value.address.state,
+              postal_code: addressData.value.address.postal_code,
+              country: addressData.value.address.country,
+            },
+          },
         },
       });
 
@@ -103,7 +131,7 @@ export const DonationSectionMobile: React.FC<DonationSectionMobileProps> = ({ cu
     }
   };
 
-  const isFormValid = amount && parseFloat(amount) >= 0.5 && cardComplete && !processing;
+  const isFormValid = amount && parseFloat(amount) >= 0.5 && cardComplete && addressComplete && !processing;
 
   return (
     <GlassCard>
@@ -151,6 +179,25 @@ export const DonationSectionMobile: React.FC<DonationSectionMobileProps> = ({ cu
           </div>
         </div>
 
+        <div className="mb-4">
+          <label className="block text-sm font-medium text-slate-700 dark:text-avus mb-2">
+            Billing Address
+          </label>
+          <div className="border border-slate-200 dark:border-grigio rounded-xl p-3 bg-white dark:bg-nero">
+            <AddressElement
+              options={{
+                mode: 'billing',
+                defaultValues: {
+                  address: {
+                    country: 'US',
+                  },
+                },
+              }}
+              onChange={handleAddressChange}
+            />
+          </div>
+        </div>
+
         <div className="mb-4">
           <label className="block text-sm font-medium text-slate-700 dark:text-avus mb-2">
             Card Details

frontend/src/features/subscription/components/PaymentMethodForm.tsx

@@ -1,28 +1,13 @@
 import React, { useState } from 'react';
 import { Box, Button, Typography, Alert, CircularProgress } from '@mui/material';
-import { CardElement, useStripe, useElements } from '@stripe/react-stripe-js';
-import type { StripeCardElementChangeEvent } from '@stripe/stripe-js';
+import { PaymentElement, AddressElement, useStripe, useElements } from '@stripe/react-stripe-js';
+import type { StripePaymentElementChangeEvent, StripeAddressElementChangeEvent } from '@stripe/stripe-js';
 
 interface PaymentMethodFormProps {
   onSubmit: (paymentMethodId: string) => void;
   isLoading?: boolean;
 }
 
-const CARD_ELEMENT_OPTIONS = {
-  style: {
-    base: {
-      fontSize: '16px',
-      color: '#424770',
-      '::placeholder': {
-        color: '#aab7c4',
-      },
-    },
-    invalid: {
-      color: '#9e2146',
-    },
-  },
-};
-
 export const PaymentMethodForm: React.FC<PaymentMethodFormProps> = ({
   onSubmit,
   isLoading = false,
@@ -31,11 +16,15 @@ export const PaymentMethodForm: React.FC<PaymentMethodFormProps> = ({
   const elements = useElements();
   const [error, setError] = useState<string | null>(null);
   const [processing, setProcessing] = useState(false);
-  const [cardComplete, setCardComplete] = useState(false);
+  const [paymentComplete, setPaymentComplete] = useState(false);
+  const [addressComplete, setAddressComplete] = useState(false);
 
-  const handleCardChange = (event: StripeCardElementChangeEvent) => {
-    setError(event.error?.message || null);
-    setCardComplete(event.complete);
+  const handlePaymentChange = (event: StripePaymentElementChangeEvent) => {
+    setPaymentComplete(event.complete);
+  };
+
+  const handleAddressChange = (event: StripeAddressElementChangeEvent) => {
+    setAddressComplete(event.complete);
   };
 
   const handleSubmit = async (event: React.FormEvent) => {
@@ -45,18 +34,49 @@ export const PaymentMethodForm: React.FC<PaymentMethodFormProps> = ({
       return;
     }
 
-    const cardElement = elements.getElement(CardElement);
-    if (!cardElement) {
-      return;
-    }
-
     setProcessing(true);
     setError(null);
 
     try {
+      // Submit the elements to validate all fields
+      const { error: submitError } = await elements.submit();
+      if (submitError) {
+        setError(submitError.message || 'Failed to validate payment details');
+        setProcessing(false);
+        return;
+      }
+
+      // Get billing details from AddressElement
+      const addressElement = elements.getElement(AddressElement);
+      if (!addressElement) {
+        setError('Address element not found');
+        setProcessing(false);
+        return;
+      }
+
+      const addressData = await addressElement.getValue();
+      if (!addressData.complete) {
+        setError('Please complete the billing address');
+        setProcessing(false);
+        return;
+      }
+
+      // Create the payment method with billing details
       const { error: createError, paymentMethod } = await stripe.createPaymentMethod({
-        type: 'card',
-        card: cardElement,
+        elements,
+        params: {
+          billing_details: {
+            name: addressData.value.name,
+            address: {
+              line1: addressData.value.address.line1,
+              line2: addressData.value.address.line2 || undefined,
+              city: addressData.value.address.city,
+              state: addressData.value.address.state,
+              postal_code: addressData.value.address.postal_code,
+              country: addressData.value.address.country,
+            },
+          },
+        },
       });
 
       if (createError) {
@@ -74,9 +94,39 @@ export const PaymentMethodForm: React.FC<PaymentMethodFormProps> = ({
     }
   };
 
+  const isFormComplete = paymentComplete && addressComplete;
+
   return (
     <form onSubmit={handleSubmit}>
       <Box sx={{ mb: 3 }}>
+        <Typography variant="subtitle2" gutterBottom>
+          Billing Address
+        </Typography>
+        <Box
+          sx={{
+            border: 1,
+            borderColor: 'divider',
+            borderRadius: 1,
+            p: 2,
+            mb: 3,
+            '&:hover': {
+              borderColor: 'primary.main',
+            },
+          }}
+        >
+          <AddressElement
+            options={{
+              mode: 'billing',
+              defaultValues: {
+                address: {
+                  country: 'US',
+                },
+              },
+            }}
+            onChange={handleAddressChange}
+          />
+        </Box>
+
         <Typography variant="subtitle2" gutterBottom>
           Card Details
         </Typography>
@@ -91,7 +141,17 @@ export const PaymentMethodForm: React.FC<PaymentMethodFormProps> = ({
             },
           }}
         >
-          <CardElement options={CARD_ELEMENT_OPTIONS} onChange={handleCardChange} />
+          <PaymentElement
+            options={{
+              layout: 'tabs',
+              fields: {
+                billingDetails: {
+                  address: 'never',
+                },
+              },
+            }}
+            onChange={handlePaymentChange}
+          />
         </Box>
       </Box>
 
@@ -106,7 +166,7 @@ export const PaymentMethodForm: React.FC<PaymentMethodFormProps> = ({
         variant="contained"
         color="primary"
         fullWidth
-        disabled={!stripe || processing || isLoading || !cardComplete}
+        disabled={!stripe || processing || isLoading || !isFormComplete}
       >
         {processing || isLoading ? (
           <CircularProgress size={24} />

frontend/src/features/subscription/mobile/SubscriptionMobileScreen.tsx

@@ -1,6 +1,7 @@
 import React, { useState } from 'react';
 import { Elements } from '@stripe/react-stripe-js';
 import { loadStripe } from '@stripe/stripe-js';
+import type { StripeElementsOptions } from '@stripe/stripe-js';
 import { format } from 'date-fns';
 import { GlassCard } from '../../../shared-minimal/components/mobile/GlassCard';
 import { MobileContainer } from '../../../shared-minimal/components/mobile/MobileContainer';
@@ -18,6 +19,12 @@ import type { BillingCycle, SubscriptionTier, SubscriptionPlan } from '../types/
 
 const stripePromise = loadStripe(import.meta.env.VITE_STRIPE_PUBLISHABLE_KEY || '');
 
+const paymentElementsOptions: StripeElementsOptions = {
+  mode: 'setup',
+  currency: 'usd',
+  paymentMethodCreation: 'manual',
+};
+
 interface MobileTierCardProps {
   plan: SubscriptionPlan;
   billingCycle: BillingCycle;
@@ -358,7 +365,7 @@ export const SubscriptionMobileScreen: React.FC = () => {
         onClose={() => !checkoutMutation.isPending && setShowPaymentDialog(false)}
         title={`Upgrade to ${selectedTier && PLANS.find((p) => p.tier === selectedTier)?.name}`}
       >
-        <Elements stripe={stripePromise}>
+        <Elements stripe={stripePromise} options={paymentElementsOptions}>
           <PaymentMethodForm
             onSubmit={handlePaymentSubmit}
             isLoading={checkoutMutation.isPending}

frontend/src/features/subscription/pages/SubscriptionPage.tsx

@@ -16,6 +16,7 @@ import {
 } from '@mui/material';
 import { Elements } from '@stripe/react-stripe-js';
 import { loadStripe } from '@stripe/stripe-js';
+import type { StripeElementsOptions } from '@stripe/stripe-js';
 import { format } from 'date-fns';
 import { Card } from '../../../shared-minimal/components/Card';
 import { TierCard } from '../components/TierCard';
@@ -36,6 +37,12 @@ import type { BillingCycle, SubscriptionTier } from '../types/subscription.types
 
 const stripePromise = loadStripe(import.meta.env.VITE_STRIPE_PUBLISHABLE_KEY || '');
 
+const paymentElementsOptions: StripeElementsOptions = {
+  mode: 'setup',
+  currency: 'usd',
+  paymentMethodCreation: 'manual',
+};
+
 export const SubscriptionPage: React.FC = () => {
   const [billingCycle, setBillingCycle] = useState<BillingCycle>('monthly');
   const [selectedTier, setSelectedTier] = useState<SubscriptionTier | null>(null);
@@ -279,7 +286,7 @@ export const SubscriptionPage: React.FC = () => {
           Upgrade to {selectedTier && PLANS.find((p) => p.tier === selectedTier)?.name}
         </DialogTitle>
         <DialogContent>
-          <Elements stripe={stripePromise}>
+          <Elements stripe={stripePromise} options={paymentElementsOptions}>
             <PaymentMethodForm
               onSubmit={handlePaymentSubmit}
               isLoading={checkoutMutation.isPending}