Hi, I’ve recently signed up to you, I’ve paid my first payment today and also got my £50 credit.
Can I ask what the credit does? Can I use it to pay some of my next bill or can I put it in my bank?

By default it just adds itself to your account credit, from which your bills are paid.

Your monthly direct debits also go into this pot.

If your account credit is higher than your monthly payments then you can contact Bulb to request that the excess be transferred to your bank account.