If you have a digital certificate you can pay self-liquidations from the Tax Agency website. This is a very safe procedure and perhaps simpler than doing so from your electricity banking, although they are common systems in both cases.
You would find the following screen:
You should report the data of the model, the period (1t, 2T, 3T or 4T depending on the quarter in which we are in place, the NIF and surname. and expressed with a comma (,) for decimal places, and the IBAN or bank account to which you want to charge the amount.
Keep in mind that the charge would be immediate, so you should make sure you have enough funds in your bank account, otherwise the charge would not be possible.
Once done, the system returns an NRC to you. It would be enough for you to copy and paste it when you answer this same email. With that NRC we can present the model correctly.
If you need help do not hesitate to contact us.