For example, in English:
P1: Can you keep this suitcase for me for an hour?
P2: Okay.
Or in the case of confirmation of information processed by the receiving person of the dialogue:
P1: I need the book now.
P2: Okay.
Do Germans use Okay or OK or what is the equivalent in those scenarios?
And considering the K in German sounds different, if OK is used, then how is it pronounced? Oh-kah? Also, if it is used at all, then where is the appropriate setting to use it (colloquially, professionally, etc.)?