curl --request GET \
  --url https://api.sandbox.bitwage.com/api/user/document/types \
  --header 'Authorization: Basic <encoded-value>'

{
  "doc_types": [
    {
      "doc_type": "<string>",
      "requires_backside": true,
      "requires_selfie": true,
      "requires_proof_of_address": true,
      "tax_id_types": [
        "<string>"
      ]
    }
  ]
}