Add SMS Notifications for Invoice Reminders

[sweep-ai]

This pull request was created by Sweep to resolve the following request by @curtisdelicata:

Description: Integrate SMS notifications to remind customers of upcoming invoice due dates and encourage timely payments.
Tasks:
Implement SMS notification functionality.
Integrate with a reliable SMS gateway.
Ensure SMS reminders are sent based on invoice due dates.
Acceptance Criteria:
Customers receive SMS reminders for upcoming due dates.
SMS notifications are sent reliably and on time.

Continue chatting at https://sweep-chat-demo.vercel.app/c/4c5a1b98-9b30-4aba-892c-4375c5a7abd3.

Purpose

Enhance customer communication by implementing SMS notifications for invoice reminders, providing customers with timely alerts about upcoming and overdue invoices.

Description

This pull request introduces a comprehensive SMS notification system for billing-related communications. The implementation includes:

• A new SmsService for sending SMS messages using a configurable SMS API
• Migration to add phone number and SMS notification preferences to the customers table
• Extended BillingService to support SMS reminders for upcoming and overdue invoices
• A new Artisan command SendInvoiceReminders to handle SMS reminder dispatching
• Configuration updates to support SMS API integration

Key features:

• Phone number formatting for international compatibility
• Configurable SMS API settings via environment variables
• Logging for SMS sending attempts
• Optional SMS notifications per customer
• Reminders for both upcoming and overdue invoices

Summary

• Added app/Services/SmsService.php for SMS sending functionality
• Created database/migrations/2024_01_20_000000_add_phone_number_to_customers_table.php
• Updated app/Services/BillingService.php with SMS reminder methods
• Added app/Console/Commands/SendInvoiceReminders.php for scheduled reminders
• Modified config/services.php to include SMS configuration
• Updated app/Console/Kernel.php to use new invoice reminder command