can i pay a friend from Linden marketplace webpage instead of SL inworld?..

[Cinnamon Lohner]

No.  You can only pay inworld

--Cinn

[Cinnamon Lohner]

No.  You can only pay inworld

--Cinn

[Peewee Musytari]

If you are somewhere that you cannot download a full graphics version of SL, you can use some of the lightweight chat clients such as Radegast to make payments. They still require a download but nothing as big as SL.

https://wiki.secondlife.com/wiki/Third_Party_Viewer_Directory