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Stripe payment processing service\n\nimport type { PaymentIntent, CheckoutRequest } from '../../shared/types.ts';\n\n// Stripe API wrapper (simplified for Val Town)\nexport class StripeService {\n private apiKey: string;\n private baseUrl = 'https://api.stripe.com/v1';\n\n constructor() {\n this.apiKey = Deno.env.get('STRIPE_SECRET_KEY') || '';\n if (!this.apiKey) {\n console.warn('STRIPE_SECRET_KEY not found in environment variables');\n }\n }\n\n /**\n * Create a payment intent for checkout\n */\n async createPaymentIntent(amount: number, currency = 'usd', metadata?: Record): Promise {\n if (!this.apiKey) {\n throw new Error('Stripe API key not configured');\n }\n\n const params = new URLSearchParams({\n amount: (amount * 100).toString(), // Convert to cents\n currency,\n automatic_payment_methods: JSON.stringify({ enabled: true }),\n });\n\n if (metadata) {\n Object.entries(metadata).forEach(([key, value]) => {\n params.append(`metadata[${key}]`, value);\n });\n }\n\n const response = await fetch(`${this.baseUrl}/payment_intents`, {\n method: 'POST',\n headers: {\n 'Authorization': `Bearer ${this.apiKey}`,\n 'Content-Type': 'application/x-www-form-urlencoded',\n },\n body: params.toString(),\n });\n\n if (!response.ok) {\n const error = await response.json();\n throw new Error(`Stripe API error: ${error.error?.message || 'Unknown error'}`);\n }\n\n const paymentIntent = await response.json();\n\n return {\n clientSecret: paymentIntent.client_secret,\n amount: amount,\n currency: currency,\n };\n }\n\n /**\n * Retrieve a payment intent\n */\n async retrievePaymentIntent(paymentIntentId: string): Promise {\n if (!this.apiKey) {\n throw new Error('Stripe API key not configured');\n }\n\n const response = await fetch(`${this.baseUrl}/payment_intents/${paymentIntentId}`, {\n headers: {\n 'Authorization': `Bearer ${this.apiKey}`,\n },\n });\n\n if (!response.ok) {\n const error = await response.json();\n throw new Error(`Stripe API error: ${error.error?.message || 'Unknown error'}`);\n }\n\n return response.json();\n }\n\n /**\n * Confirm a payment intent\n */\n async confirmPaymentIntent(paymentIntentId: string, paymentMethodId: string): Promise {\n if (!this.apiKey) {\n throw new Error('Stripe API key not configured');\n }\n\n const params = new URLSearchParams({\n payment_method: paymentMethodId,\n });\n\n const response = await fetch(`${this.baseUrl}/payment_intents/${paymentIntentId}/confirm`, {\n method: 'POST',\n headers: {\n 'Authorization': `Bearer ${this.apiKey}`,\n 'Content-Type': 'application/x-www-form-urlencoded',\n },\n body: params.toString(),\n });\n\n if (!response.ok) {\n const error = await response.json();\n throw new Error(`Stripe API error: ${error.error?.message || 'Unknown error'}`);\n }\n\n return response.json();\n }\n\n /**\n * Create a customer\n */\n async createCustomer(email: string, name?: string, metadata?: Record): Promise {\n if (!this.apiKey) {\n throw new Error('Stripe API key not configured');\n }\n\n const params = new URLSearchParams({\n email,\n });\n\n if (name) {\n params.append('name', name);\n }\n\n if (metadata) {\n Object.entries(metadata).forEach(([key, value]) => {\n params.append(`metadata[${key}]`, value);\n });\n }\n\n const response = await fetch(`${this.baseUrl}/customers`, {\n method: 'POST',\n headers: {\n 'Authorization': `Bearer ${this.apiKey}`,\n 'Content-Type': 'application/x-www-form-urlencoded',\n },\n body: params.toString(),\n });\n\n if (!response.ok) {\n const error = await response.json();\n throw new Error(`Stripe API error: ${error.error?.message || 'Unknown error'}`);\n }\n\n return response.json();\n }\n\n /**\n * Create a refund\n */\n async createRefund(paymentIntentId: string, amount?: number, reason?: string): Promise {\n if (!this.apiKey) {\n throw new Error('Stripe API key not configured');\n }\n\n const params = new URLSearchParams({\n payment_intent: paymentIntentId,\n });\n\n if (amount) {\n params.append('amount', (amount * 100).toString()); // Convert to cents\n }\n\n if (reason) {\n params.append('reason', reason);\n }\n\n const response = await fetch(`${this.baseUrl}/refunds`, {\n method: 'POST',\n headers: {\n 'Authorization': `Bearer ${this.apiKey}`,\n 'Content-Type': 'application/x-www-form-urlencoded',\n },\n body: params.toString(),\n });\n\n if (!response.ok) {\n const error = await response.json();\n throw new Error(`Stripe API error: ${error.error?.message || 'Unknown error'}`);\n }\n\n return response.json();\n }\n\n /**\n * Handle webhook events\n */\n async handleWebhook(payload: string, signature: string): Promise {\n // In a full implementation, you would verify the webhook signature\n // For now, we'll just parse the payload\n try {\n return JSON.parse(payload);\n } catch (error) {\n throw new Error('Invalid webhook payload');\n }\n }\n\n /**\n * Calculate application fee (if using Stripe Connect)\n */\n calculateApplicationFee(amount: number, feePercentage = 2.9): number {\n return Math.round(amount * (feePercentage / 100) * 100) / 100;\n }\n\n /**\n * Format amount for display\n */\n formatAmount(amount: number, currency = 'usd'): string {\n return new Intl.NumberFormat('en-US', {\n style: 'currency',\n currency: currency.toUpperCase(),\n }).format(amount);\n }\n\n /**\n * Validate webhook signature (simplified)\n */\n validateWebhookSignature(payload: string, signature: string, secret: string): boolean {\n // In production, implement proper Stripe webhook signature validation\n // This is a simplified version for demonstration\n return signature.includes('v1=');\n }\n}\n\n// Payment processing utilities\nexport class PaymentUtils {\n /**\n * Calculate order totals including tax and shipping\n */\n static calculateOrderTotals(\n subtotal: number,\n taxRate = 0.08,\n shippingCost = 0\n ): { subtotal: number; tax: number; shipping: number; total: number } {\n const tax = Math.round(subtotal * taxRate * 100) / 100;\n const total = subtotal + tax + shippingCost;\n \n return {\n subtotal,\n tax,\n shipping: shippingCost,\n total,\n };\n }\n\n /**\n * Calculate shipping cost based on order value and weight\n */\n static calculateShipping(orderValue: number, weight = 1, country = 'US'): number {\n // Free shipping over $500 for US orders\n if (country === 'US' && orderValue >= 500) return 0;\n \n // Base shipping rates\n const baseRates: Record = {\n 'US': 15,\n 'CA': 25,\n 'MX': 30,\n 'GB': 35,\n 'EU': 40,\n 'OTHER': 50,\n };\n\n const baseRate = baseRates[country] || baseRates['OTHER'];\n const weightRate = Math.max(0, (weight - 1) * 5);\n \n return baseRate + weightRate;\n }\n\n /**\n * Validate credit card number (basic Luhn algorithm)\n */\n static validateCreditCard(cardNumber: string): boolean {\n const digits = cardNumber.replace(/\\D/g, '');\n \n if (digits.length < 13 || digits.length > 19) {\n return false;\n }\n\n let sum = 0;\n let isEven = false;\n\n for (let i = digits.length - 1; i >= 0; i--) {\n let digit = parseInt(digits[i]);\n\n if (isEven) {\n digit *= 2;\n if (digit > 9) {\n digit -= 9;\n }\n }\n\n sum += digit;\n isEven = !isEven;\n }\n\n return sum % 10 === 0;\n }\n\n /**\n * Get card type from number\n */\n static getCardType(cardNumber: string): string {\n const digits = cardNumber.replace(/\\D/g, '');\n \n if (/^4/.test(digits)) return 'visa';\n if (/^5[1-5]/.test(digits)) return 'mastercard';\n if (/^3[47]/.test(digits)) return 'amex';\n if (/^6(?:011|5)/.test(digits)) return 'discover';\n \n return 'unknown';\n }\n\n /**\n * Format card number for display\n */\n static formatCardNumber(cardNumber: string): string {\n const digits = cardNumber.replace(/\\D/g, '');\n return digits.replace(/(\\d{4})(?=\\d)/g, '$1 ');\n }\n\n /**\n * Mask card number for security\n */\n static maskCardNumber(cardNumber: string): string {\n const digits = cardNumber.replace(/\\D/g, '');\n if (digits.length < 4) return '*'.repeat(digits.length);\n \n const lastFour = digits.slice(-4);\n const masked = '*'.repeat(digits.length - 4);\n \n return masked + lastFour;\n }\n}\n\n// Export singleton instance\nexport const stripeService = new StripeService();","deleted","label",[167,168,149],"backend","services","permalink","https://www.val.town/x/lee_roy/Test2/code/backend/services/stripe.ts","extension","actionData","errors"]