How to enforce a European order of payment in Barcelona

Hi

I have aquired a European order of payment (Requierimento europeo de pago) against Vueling airlines s.a for a flight ticket that was cancelled. The European order of payment is per definition enforceable in all of the EU. I just need to know how I can enforce it in Spain, or more specifically in Barcelona where the company is situated. Which court/governmental body do I need to address, what documentation do I need to provide etc? I will be very grateful for any useful information on this matter!

https://e-justice.europa.eu/41/EN/european_payment_order

I have read that site which states that "A copy of the European Payment Order, and if necessary a translation, must be sent to the enforcement authorities of the Member State where it needs to be enforced".

I still do not know who is the correct enforcement authorities for Barcelona. Also, I guess they will be needing something more then just a copy of the payment order? For example a bank account where to transfer the money when it has been enforced.