curl --request GET \
  --url https://sandbox.soleaspay.com/api/action/card/user/{reference} \
  --header 'Authorization: Bearer <token>' \
  --header 'x-sp-auth-token: <x-sp-auth-token>'

{
  "user_id": "<string>",
  "first_name": "<string>",
  "last_name": "<string>",
  "email": "<string>",
  "cards": [
    "<string>"
  ]
}