curl --request POST \
  --url https://sandbox.soleaspay.com/api/action/card/{userId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'x-sp-auth-token: <x-sp-auth-token>' \
  --data '
{
  "balance": "10",
  "currency": "USD"
}
'

{
  "card_id": "<string>",
  "card_number": "<string>",
  "expiry": "<string>",
  "cvv": "<string>"
}