Create gift card

curl --request POST \
  --url https://api.{id}.gr4vy.app/gift-cards \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "number": "4123455541234561234",
  "pin": "1234"
}'

{
  "type": "gift-card",
  "id": "356d56e5-fe16-42ae-97ee-8d55d846ae2e",
  "merchant_account_id": "default",
  "gift_card_service": {
    "type": "gift-card-service",
    "id": "35b60feec-a7c7-4844-b503-f39b09192d81",
    "gift_card_service_definition_id": "qwikcilver-gift-card",
    "display_name": "Qwikcilver USA"
  },
  "bin": "412345",
  "sub_bin": "554",
  "last4": "1234",
  "expiration_date": "2013-07-16T19:23:00.000+00:00",
  "buyer": {
    "type": "buyer",
    "id": "fe26475d-ec3e-4884-9553-f7356683f7f9",
    "merchant_account_id": "default",
    "display_name": "John Doe",
    "external_identifier": "buyer-12345",
    "billing_details": {
      "first_name": "John",
      "last_name": "Doe",
      "email_address": "john@example.com",
      "phone_number": "+1234567890",
      "address": {
        "city": "San Jose",
        "country": "US",
        "postal_code": "94560",
        "state": "California",
        "state_code": "US-CA",
        "house_number_or_name": "10",
        "line1": "Stafford Appartments",
        "line2": "29th Street",
        "organization": "Gr4vy"
      },
      "tax_id": {
        "value": "12345678931",
        "kind": "us.ein"
      }
    },
    "account_number": "<string>",
    "created_at": "2013-07-16T19:23:00.000+00:00",
    "updated_at": "2013-07-16T19:23:00.000+00:00"
  },
  "created_at": "2013-07-16T19:23:00.000+00:00",
  "updated_at": "2013-07-16T19:23:00.000+00:00"
}