curl --request POST \
  --url https://cloud.laravel.com/api/environments/{environment}/variables \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "variables": [
    {
      "key": "<string>",
      "value": "<string>"
    }
  ]
}
'

{
  "data": {
    "id": "<string>",
    "links": {
      "self": {
        "href": "<string>",
        "rel": "<string>",
        "describedby": "<string>",
        "title": "<string>",
        "type": "<string>",
        "hreflang": "<string>",
        "meta": {}
      }
    },
    "attributes": {
      "name": "<string>",
      "slug": "<string>",
      "created_from_automation": true,
      "vanity_domain": "<string>",
      "build_command": "<string>",
      "deploy_command": "<string>",
      "uses_octane": true,
      "uses_push_to_deploy": true,
      "uses_deploy_hook": true,
      "environment_variables": [
        {
          "key": "<string>",
          "value": "<string>"
        }
      ],
      "network_settings": {
        "cache": {
          "strategy": "<string>"
        },
        "response_headers": {
          "frame": "<string>",
          "content_type": "<string>",
          "hsts": {
            "max_age": 123,
            "include_subdomains": true,
            "preload": true
          }
        },
        "firewall": {
          "bot_categories": [],
          "rate_limit": {
            "429": true,
            "4xx": true
          },
          "under_attack_mode_started_at": "<string>",
          "block_path": true
        },
        "content_converter": true
      },
      "created_at": "2023-11-07T05:31:56Z"
    },
    "relationships": {
      "application": {
        "data": {
          "id": "<string>"
        }
      },
      "branch": {
        "data": {
          "id": "<string>"
        }
      },
      "deployments": {
        "data": [
          {
            "id": "<string>"
          }
        ]
      },
      "currentDeployment": {
        "data": {
          "id": "<string>"
        }
      },
      "domains": {
        "data": [
          {
            "id": "<string>"
          }
        ]
      },
      "primaryDomain": {
        "data": {
          "id": "<string>"
        }
      },
      "instances": {
        "data": [
          {
            "id": "<string>"
          }
        ]
      },
      "database": {
        "data": {
          "id": "<string>"
        }
      },
      "cache": {
        "data": {
          "id": "<string>"
        }
      },
      "buckets": {
        "data": [
          {
            "id": "<string>"
          }
        ]
      },
      "websocketApplication": {
        "data": {
          "id": "<string>"
        }
      }
    }
  },
  "included": [
    {
      "id": "<string>",
      "attributes": {
        "name": "<string>",
        "slug": "<string>",
        "slack_channel": "<string>",
        "avatar_url": "<string>",
        "created_at": "2023-11-07T05:31:56Z",
        "repository": {
          "full_name": "<string>",
          "default_branch": "<string>"
        }
      },
      "relationships": {
        "repository": {
          "data": {
            "id": "<string>"
          }
        },
        "organization": {
          "data": {
            "id": "<string>"
          }
        },
        "environments": {
          "data": [
            {
              "id": "<string>"
            }
          ]
        },
        "deployments": {
          "data": [
            {
              "id": "<string>"
            }
          ]
        },
        "defaultEnvironment": {
          "data": {
            "id": "<string>"
          }
        }
      }
    }
  ]
}