It is important to clarify that "valid card generators" for BBVA or any other bank are fraudulent tools.
Intentar usar un generador de tarjetas válidas o las tarjetas que de él se obtengan puede acarrearte graves problemas.
A "kill switch" in the app that allows the user to disable all generated cards with one tap without affecting their physical plastic card [1, 5]. Merchant Locking: