Hello, I know how to buy BTC in Coinbase, that was not the question.

Also in your post you have several errors that although they have nothing to do with the operation, I would like you to know them:

YOU SAY:

1) Transfer PP balance to bank account (FREE) - Not mate, have fee

2) Transfer $ 100 from bank account to Coinbase (FREE) - Not mate, have fee

3) Buy BTC at market price on Coinbase (FREE) - Not mate, have fee

But I breathe that was not the issue, I've already thanked Vibez1Tv for the interest.