curl --request GET \
  --url https://api.proposales.com/v3/proposals/{uuid} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "title": "<string>",
    "title_md": "<string>",
    "description_html": "<string>",
    "description_md": "<string>",
    "archived_at": 123,
    "attachments": [
      {}
    ],
    "background_image": {
      "id": 123,
      "uuid": "<string>"
    },
    "background_video": {
      "id": 123,
      "uuid": "<string>"
    },
    "blocks": [
      {}
    ],
    "company_address": "<string>",
    "company_email": "<string>",
    "company_id": 123,
    "company_logo_uuid": "<string>",
    "company_powerups": {},
    "company_powerups_live": {},
    "company_name": "<string>",
    "company_phone": "<string>",
    "company_registration_number": "<string>",
    "company_tax_mode_live": "<string>",
    "company_timezone": "<string>",
    "company_avatar_uuid": "<string>",
    "contact_email": "<string>",
    "contact_name": "<string>",
    "contact_phone": "<string>",
    "contact_title": "<string>",
    "creator_id": 123,
    "creator_name": "<string>",
    "currency": "<string>",
    "data": {},
    "editor": {
      "notification_user_ids": {}
    },
    "expires_at": 123,
    "invoicing": {},
    "is_agreement": true,
    "is_only_proposal_in_series": true,
    "is_test": true,
    "pending": true,
    "pending_reason": "<string>",
    "recipient_company_name": "<string>",
    "recipient_email": "<string>",
    "recipient_id": 123,
    "recipient_is_set": true,
    "recipient_name": "<string>",
    "recipient_phone": "<string>",
    "recipient_sources": {},
    "series_uuid": "<string>",
    "signatures": [
      {}
    ],
    "status_changed_at": 123,
    "tax_options": {},
    "tracking": {},
    "updated_at": 123,
    "value_with_tax": 123,
    "value_without_tax": 123,
    "version": 123,
    "payments_enabled": true,
    "contact_avatar_transform": "<string>",
    "user_email": "<string>",
    "payment": {},
    "status": "<string>",
    "uuid": "<string>",
    "language": "<string>",
    "background_image_uuid": "<string>"
  }
}