Create Contact
POST /v1/contacts
{
"phone": "+1234567890",
"name": "John Doe",
"email": "john@example.com",
"tags": ["customer", "vip"],
"custom_fields": {
"company": "Acme Inc"
}
}Create Group
POST /v1/groups
{
"name": "VIP Customers",
"description": "High-value customers",
"contacts": ["cnt_abc123", "cnt_def456"]
}