CDS: upfront premium and upfront payment?

CFA Level II Fixed Income
#1

Hi, can anyone explain:

Do upfront premium and upfront payment mean the same?

What is upfront payment used for in valuing CDS spread or CDS price?

Thank you.

#2

Upfront payment = (PV of protection leg – PV of premium leg)

Upfront premium % ≈ (Credit spread – Fixed coupon) × Duration = (100 – Price of CDS in currency per 100 Par)