twilio-communications

# Twilio Communications ## Patterns ### SMS Sending Pattern Basic pattern for sending SMS messages with Twilio. Handles the fundamentals: phone number formatting, message delivery, and delivery status callbacks. Key considerations: - Phone numbers must be in E.164 format (+1234567890) - Default rate limit: 80 messages per second (MPS) - Messages over 160 characters are split (and cost more) - Carrier filtering can block messages (especially to US numbers) **When to use**: ['Sending notifications to users', 'Transactional messages (order confirmations, shipping)', 'Alerts and reminders'] ```python from twilio.rest import Client from twilio.base.exceptions import TwilioRestException import os import re class TwilioSMS: """ SMS sending with proper error handling and validation. """ def __init__(self): self.client = Client( os.environ["TWILIO_ACCOUNT_SID"], os.environ["TWILIO_AUTH_TOKEN"] ) self.from_number = os.environ["TWILIO_PHONE_NUMBER"] def validate_e164(self, phone: str) -> bool: """Validate phone number is in E.164 format.""" pattern = r'^\+[1-9]\d{1,14}$' return bool(re.match(pattern, phone)) def send_sms( self, to: str, body: str, status_callback: str = None ) -> dict: """ Send an SMS message. Args: to: Recipient phone number in E.164 format body: Message text (160 chars = 1 segmen...