curl --request GET \
  --url https://api.atlas.co/functions/v1/customers/{customer_id} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "object": "customer",
  "email": "<string>",
  "name": "<string>",
  "phone": "<string>",
  "description": "<string>",
  "billing_address": {
    "line1": "<string>",
    "line2": "<string>",
    "city": "<string>",
    "state": "<string>",
    "postal_code": "<string>",
    "country": "<string>"
  },
  "shipping_address": {
    "line1": "<string>",
    "line2": "<string>",
    "city": "<string>",
    "state": "<string>",
    "postal_code": "<string>",
    "country": "<string>"
  },
  "default_payment_method": "<string>",
  "tax_exempt": true,
  "tax_ids": [
    {
      "type": "<string>",
      "value": "<string>"
    }
  ],
  "metadata": {},
  "created": 123
}