SendGrid Substitution Tags — Legacy Template Personalization with -name- Syntax

from sendgrid import SendGridAPIClient
from sendgrid.helpers.mail import Mail, Substitution

def send_legacy_invoice(to_email, customer_name, invoice_id, amount):
    message = Mail(
        from_email='billing@dodatech.com',
        to_emails=to_email,
        subject=f'Invoice #{invoice_id}',
        html_content='''
            <h1>Invoice #-invoiceId-</h1>
            <p>Dear -customerName-,</p>
            <p>Your invoice for -totalAmount- is ready.</p>
            <p>View invoice: <a href="https://dodatech.com/invoices/-invoiceId-">Link</a></p>
        '''
    )

    # Add substitutions
    message.add_substitution(Substitution('-customerName-', customer_name))
    message.add_substitution(Substitution('-invoiceId-', str(invoice_id)))
    message.add_substitution(Substitution('-totalAmount-', f'${amount:.2f}'))

    sg = SendGridAPIClient(SENDGRID_API_KEY)
    response = sg.send(message)
    return response.status_code == 202

def send_bulk_with_substitutions(recipients):
    """Send the same email to multiple recipients with different substitutions"""
    personalizations = []

    for r in recipients:
        personalization = {
            "to": [{"email": r["email"]}],
            "substitutions": {
                "-name-": r["name"],
                "-product-": r["product"],
                "-price-": f"${r['price']:.2f}",
                "-discount-": r.get("discount", "0%"),
                "-expiry-": r["expiry"]
            }
        }
        personalizations.append(personalization)

    response = requests.post(
        "https://api.sendgrid.com/v3/mail/send",
        headers={
            "Authorization": f"Bearer {SENDGRID_API_KEY}",
            "Content-Type": "application/json"
        },
        json={
            "personalizations": personalizations,
            "from": {"email": "offers@dodatech.com"},
            "subject": "Special Offer for -name-!",
            "content": [{"type": "text/html", "value": '''
                <h1>Hi -name-!</h1>
                <p>We have a special offer on -product-.</p>
                <p>Regular price: -price-</p>
                <p>Your discount: -discount-</p>
                <p>Offer expires: -expiry-</p>
            '''}]
        }
    )
    return response.status_code == 202

def send_with_sections(to_email, section_name):
    message = Mail(
        from_email='noreply@dodatech.com',
        to_emails=to_email,
        subject='Your DodaTech Update'
    )

    # Define sections
    sections = {
        "-header-": '''
            <div style="background:#2563eb;color:white;padding:20px;">
                <h1>DodaTech</h1>
            </div>
        ''',
        "-footer-": '''
            <div style="background:#f3f4f6;padding:10px;margin-top:20px;">
                <p>DodaTech Inc. - Built by the developers of Doda Browser</p>
                <p><a href="https://dodatech.com/unsubscribe">Unsubscribe</a></p>
            </div>
        ''',
        "-promo-" if section_name == "premium" else "-standard-": '''
            <div style="border:2px solid gold;padding:15px;">
                <h2>Premium Feature Available!</h2>
            </div>
        ''' if section_name == "premium" else '''
            <div style="padding:15px;">
                <p>Standard features included.</p>
            </div>
        '''
    }

    message.html_content = '''
        -header-
        <div style="padding:20px;">
            <h2>Welcome, -name-!</h2>
            <p>Your account is ready.</p>
            -content-
        </div>
        -footer-
    '''