curl --request GET \
  --url https://api.sandbox.solidfi.com/v2/attachment/{attachment_id} \
  --header 'api-key: <api-key>'

{
  "id": "att_a8d2b191fa0e960d8e49a4bfd320e07b",
  "reference_id": "ctp_8e5541c8a9e50c3af3b0daacf9175130",
  "label": "formation",
  "url": "http://bucket.s3-website-us-east-1.amazonaws.com",
  "created_at": "2024-04-04T11:06:00Z"
}