Pick up and Pay for

Pick up verb - To get possession of (something) by giving money in exchange for.

Pay for is a synonym for pick up in action topic. In some cases you can use "Pay for" instead a verb "Pick up", when it comes to topics like purchase.

Pay for verb - Have as a guest.

Pick up is a synonym for pay for in action topic. You can use "Pick up" instead a verb "Pay for", if it concerns topics such as purchase, buy.