Code:
callfunc_begin("set_item_amount","HarbuRPAlpha.amxx")
callfunc_push_int( id )
callfunc_push_str( "+" )
callfunc_push_int( 411 )
callfunc_push_int( 1 )
callfunc_push_str( "money" )
callfunc_end()
this would be the right one.
but you want to call a stock, and you can't call a stock outside of the plugin.
If you want to call a function in a plugin then the function has to be marked as "public"