Notification System

Overview

Inventario includes a comprehensive notification system supporting both email (via Resend) and SMS (via Twilio) notifications. These notifications are triggered automatically for events like contact form submissions, password resets, and customer campaigns.

Email Notifications (Resend)

Inventario uses Resend for reliable email delivery with a simple API.

Configuration

Email settings in settings.py:

inventario/settings.py

RESEND_API_KEY = os.environ.get('RESEND_API_KEY', '')
DEFAULT_FROM_EMAIL = os.environ.get("DEFAULT_FROM_EMAIL")

Environment Variables

Add these to your .env file:

.env

RESEND_API_KEY=re_your_api_key_here
DEFAULT_FROM_EMAIL=sistema@yourdomain.com

You must verify your domain in Resend before sending emails. Unverified domains are limited to test mode.

Setting Up Resend

Create Resend Account

Verify Your Domain

Add your domain and configure DNS records:

SPF record
DKIM records
DMARC record (optional but recommended)

Generate API Key

Go to API Keys in the Resend dashboard and create a new key.Copy the key and add it to your .env file.

Test Email Sending

Use the email service to send a test email:

python manage.py shell
>>> from applications.cuentas.email_service import enviar_email
>>> enviar_email('test@example.com', 'Test', '<h1>Hello</h1>')

Email Service Implementation

The email service is implemented in applications/cuentas/email_service.py:

applications/cuentas/email_service.py

import resend
from django.conf import settings

def enviar_email(destinatario, asunto, html):
    resend.api_key = settings.RESEND_API_KEY
    try:
        resend.Emails.send({
            "from": "sistema@hjmanager.site",
            "to": [destinatario],
            "subject": asunto,
            "html": html,
        })
        return True
    except Exception as e:
        print(f"Error enviando email: {e}")
        return False

Email Notification Triggers

Emails are automatically sent for:

1. Contact Form Submissions

When users submit the contact form on the home page:

applications/cuentas/views.py

resend.Emails.send({
    "from": settings.DEFAULT_FROM_EMAIL,
    "to": ["davidnoguera2202@gmail.com"],
    "subject": f"Nuevo mensaje de contacto de {nombre}",
    "text": mensaje,
    "reply_to": email,
})

2. Password Reset Requests

When users request a password reset, they receive a verification code via email.

3. Custom Notifications

Developers can trigger custom emails using the enviar_email() function:

from applications.cuentas.email_service import enviar_email

# Send HTML email
html_content = """
<h1>¡Bienvenido!</h1>
<p>Tu cuenta ha sido activada.</p>
"""

enviar_email(
    destinatario='user@example.com',
    asunto='Cuenta Activada',
    html=html_content
)

SMS Notifications (Twilio)

Inventario uses Twilio for SMS messaging, enabling customer campaigns and alerts.

Configuration

Twilio settings in settings.py:

inventario/settings.py

TWILIO_ACCOUNT_SID = os.environ.get('TWILIO_ACCOUNT_SID', '')
TWILIO_AUTH_TOKEN = os.environ.get('TWILIO_AUTH_TOKEN', '')
TWILIO_PHONE_NUMBER = os.environ.get('TWILIO_PHONE_NUMBER', '')

Environment Variables

Add these to your .env file:

.env

TWILIO_ACCOUNT_SID=ACxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
TWILIO_AUTH_TOKEN=your_auth_token_here
TWILIO_PHONE_NUMBER=+1234567890

Twilio phone numbers must be in E.164 format (e.g., +57 for Colombia). SMS messaging rates apply.

Setting Up Twilio

Create Twilio Account

Get a Phone Number

Purchase a phone number with SMS capabilities for your country.For Colombia: Look for numbers starting with +57.

Copy Credentials

From the Twilio Console dashboard:

Copy Account SID
Copy Auth Token
Copy your Twilio Phone Number

Add these to your .env file.

Test SMS Sending

Use the SMS service to send a test message:

python manage.py shell
>>> from applications.clientes.sms_providers import enviar_sms_twilio
>>> enviar_sms_twilio('+573001234567', 'Test message')
(True, 'SMxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx')

SMS Service Implementation

The SMS provider is implemented in applications/clientes/sms_providers.py:

applications/clientes/sms_providers.py

from twilio.rest import Client
from twilio.base.exceptions import TwilioRestException
from django.conf import settings

def enviar_sms_twilio(to, message):
    """
    Envía SMS usando Twilio
    Returns: (success: bool, detail: str)
    """
    account_sid = settings.TWILIO_ACCOUNT_SID
    auth_token = settings.TWILIO_AUTH_TOKEN
    phone_number = settings.TWILIO_PHONE_NUMBER
    
    # Validar configuración
    if not account_sid or not auth_token or not phone_number:
        return False, "Twilio no está configurado"
    
    try:
        client = Client(account_sid, auth_token)
        msg = client.messages.create(
            body=message,
            from_=phone_number,
            to=to
        )
        return True, msg.sid
    except TwilioRestException as e:
        return False, f"Error Twilio: {str(e)}"

Phone Number Formatting

Inventario automatically formats Colombian phone numbers to E.164 format:

applications/clientes/utils.py

def formatear_telefono_colombia(telefono):
    """Convierte teléfono de 10 dígitos a formato internacional +57"""
    # 3001234567 → +573001234567
    # +573001234567 → +573001234567 (no change)
    if len(telefono) == 10 and telefono.isdigit():
        return f'+57{telefono}'
    return telefono

SMS Campaigns

Inventario includes a customer campaign system (applications/clientes/models.py):

CampanaSMS: Defines SMS campaigns with templates
PlantillaSMS: Reusable message templates with variables like {nombre}
SMSLog: Tracks all sent messages with status and Twilio SID

Creating a Campaign

Create a template in Django admin:

Hola {nombre}, tenemos una oferta especial para ti...

Create a campaign and select customers

Send SMS campaign:

from applications.clientes.utils import enviar_sms_masivo

resultados = enviar_sms_masivo(
    clientes=clientes_queryset,
    mensaje="Hola {nombre}, ...",
    campana=campana_obj,
    delay_ms=1000  # 1 second delay between messages
)

SMS Logging

All SMS messages are logged in the SMSLog model:

applications/clientes/models.py

class SMSLog(models.Model):
    campana = models.ForeignKey(CampanaSMS, on_delete=models.CASCADE)
    cliente = models.ForeignKey(Cliente, on_delete=models.CASCADE)
    mensaje = models.TextField()
    estado = models.CharField(max_length=20)  # 'enviado' or 'fallido'
    twilio_sid = models.CharField(max_length=100)  # Twilio message SID
    error_mensaje = models.TextField(blank=True)
    creado = models.DateTimeField(auto_now_add=True)

Notification Best Practices

Rate Limiting

Implement delays between bulk SMS to avoid rate limits:

delay_ms=1000  # 1 second between messages

Error Handling

Always check return values and log errors:

success, detail = enviar_sms_twilio(phone, msg)
if not success:
    logger.error(f"SMS failed: {detail}")

Testing

Use Twilio test credentials during development to avoid charges.

Compliance

Ensure customers opt-in to SMS campaigns. Include unsubscribe options.

Troubleshooting

Resend emails not sending

Verify your domain is confirmed in Resend dashboard
Check DNS records are properly configured
Verify RESEND_API_KEY in .env is correct
Check application logs for error messages

Test manually:

python manage.py shell
>>> import resend
>>> from django.conf import settings
>>> resend.api_key = settings.RESEND_API_KEY
>>> resend.Emails.send({
    "from": "test@yourdomain.com",
    "to": ["your@email.com"],
    "subject": "Test",
    "html": "<p>Test</p>"
})

Twilio SMS failing

Common issues:

Invalid phone number format: Must be E.164 format (e.g., +573001234567)
Unverified number (trial accounts): Add recipient to verified numbers
Insufficient balance: Check Twilio account balance
Wrong phone number: Verify TWILIO_PHONE_NUMBER is your Twilio number

Check error messages in SMSLog.error_mensaje field.

Missing environment variables

If notifications aren’t working, verify all required variables are set:

python manage.py shell
>>> from django.conf import settings
>>> print(settings.RESEND_API_KEY)
>>> print(settings.TWILIO_ACCOUNT_SID)
>>> print(settings.TWILIO_PHONE_NUMBER)

Empty strings indicate missing environment variables.

Next Steps

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Core Features

User Management

Advanced

Overview

Email Notifications (Resend)

Configuration

Environment Variables

Setting Up Resend

Email Service Implementation

Email Notification Triggers

1. Contact Form Submissions

2. Password Reset Requests

3. Custom Notifications

SMS Notifications (Twilio)

Configuration

Environment Variables

Setting Up Twilio

SMS Service Implementation

Phone Number Formatting

SMS Campaigns

Creating a Campaign

SMS Logging

Notification Best Practices

Rate Limiting

Error Handling

Testing

Compliance

Troubleshooting

Next Steps

AI Features

Integrations

​Overview

​Email Notifications (Resend)

​Configuration

​Environment Variables

​Setting Up Resend

​Email Service Implementation

​Email Notification Triggers

​1. Contact Form Submissions

​2. Password Reset Requests

​3. Custom Notifications

​SMS Notifications (Twilio)

​Configuration

​Environment Variables

​Setting Up Twilio

​SMS Service Implementation

​Phone Number Formatting

​SMS Campaigns

​Creating a Campaign

​SMS Logging

​Notification Best Practices

Rate Limiting

Error Handling

Testing

Compliance

​Troubleshooting

​Next Steps

AI Features

Integrations

Overview

Email Notifications (Resend)

Configuration

Environment Variables

Setting Up Resend

Email Service Implementation

Email Notification Triggers

1. Contact Form Submissions

2. Password Reset Requests

3. Custom Notifications

SMS Notifications (Twilio)

Configuration

Environment Variables

Setting Up Twilio

SMS Service Implementation

Phone Number Formatting

SMS Campaigns

Creating a Campaign

SMS Logging

Notification Best Practices

Troubleshooting

Next Steps