Migrate from SendGrid

# Before
npm install @sendgrid/mail

# After
npm install send0

# Before
pip install sendgrid

# After
pip install send0

# Before
go get github.com/sendgrid/sendgrid-go

# After
go get github.com/send0/send0-go

// Before (SendGrid)
import sgMail from '@sendgrid/mail';
sgMail.setApiKey('SG.xxx');

// After (send0)
import { Send0 } from 'send0';
const send0 = new Send0('sk_live_...');

# Before (SendGrid)
from sendgrid import SendGridAPIClient
sg = SendGridAPIClient("SG.xxx")

# After (send0)
from send0 import Send0
client = Send0("sk_live_...")

// Before (SendGrid)
client := sendgrid.NewSendClient("SG.xxx")

// After (send0)
client := send0.New("sk_live_...")

// Before (SendGrid)
await sgMail.send({
  to: 'user@example.com',
  from: 'hello@acme.com',
  subject: 'Welcome',
  html: '<p>Hello</p>',
  categories: ['onboarding'],
  customArgs: { user_id: '123' },
});

// After (send0)
await send0.emails.send({
  from: 'hello@acme.com',
  to: 'user@example.com',
  subject: 'Welcome',
  html: '<p>Hello</p>',
  tags: { category: 'onboarding' },
  metadata: { user_id: '123' },
});

# Before (SendGrid)
from sendgrid.helpers.mail import Mail
message = Mail(
    from_email="hello@acme.com",
    to_emails="user@example.com",
    subject="Welcome",
    html_content="<p>Hello</p>",
)
sg.send(message)

# After (send0)
client.emails.send(
    from_address="hello@acme.com",
    to="user@example.com",
    subject="Welcome",
    html="<p>Hello</p>",
)

// Before (SendGrid)
from := mail.NewEmail("Acme", "hello@acme.com")
to := mail.NewEmail("User", "user@example.com")
message := mail.NewSingleEmail(from, "Welcome", to, "Hello", "<p>Hello</p>")
client.Send(message)

// After (send0)
client.Emails.Send(ctx, &send0.SendEmailParams{
    From:    "Acme <hello@acme.com>",
    To:      []string{"user@example.com"},
    Subject: "Welcome",
    HTML:    "<p>Hello</p>",
})

// Before (SendGrid)
await sgMail.send({
  personalizations: [
    { to: 'jane@example.com', dynamicTemplateData: { name: 'Jane' } },
    { to: 'john@example.com', dynamicTemplateData: { name: 'John' } },
  ],
  from: 'hello@acme.com',
  templateId: 'd-xxx',
});

// After (send0)
await send0.emails.batch({
  from: 'hello@acme.com',
  subject: 'Monthly Update',
  template: 'tmpl_monthly',
  recipients: [
    { to: 'jane@example.com', variables: { name: 'Jane' } },
    { to: 'john@example.com', variables: { name: 'John' } },
  ],
});

// Server-side template
const template = await send0.templates.create({
  name: 'welcome',
  subject: 'Welcome, {{name}}!',
  html: '<h1>Hello {{name}}</h1><p>Welcome to {{company}}.</p>',
});

// Use in a send
await send0.emails.send({
  from: 'hello@acme.com',
  to: 'user@example.com',
  subject: 'Welcome!',
  template: template.id,
  data: { name: 'Jane', company: 'Acme' },
});

// send0 webhook verification
import { Send0 } from 'send0';

const event = Send0.webhooks.verify(
  requestBody,
  requestHeaders,
  'whsec_...',
);

switch (event.type) {
  case 'email.delivered':
    // handle delivery
    break;
  case 'email.bounced':
    // handle bounce
    break;
}