order --from=mtQheFaSfWELRB2MyMBaiWjdDm6ux9Ezns --get-quantity=10 --get-asset=BTC
--give-quantity=20 --give-asset=XCP --expiration=10 --fee_provided=.001
Buy BBBC for BTC

order --from=mtQheFaSfWELRB2MyMBaiWjdDm6ux9Ezns --get-quantity=10 --get-asset=BBBC
--give-quantity=20 --give-asset=BTC --expiration=10 --fee_required.001
Buy XCP for BBBC

order --from=mtQheFaSfWELRB2MyMBaiWjdDm6ux9Ezns --get-quantity=10 --get-asset=XCP
--give-quantity=20 --give-asset=BBBC --expiration=10

Why does first have --fee_provided, second have --fee_required and third have no fee?

Again, all fees are in XCP?

How does this actually get recorded into BTC blockchain without BTC fee?