MARIOAPG

Hello, i need to create a new menu or submenu wich show a new page custom where i gonna add various functions, i think i have to create a addons but how can i join the output from menu.tpl with the output admin area? and relate when the admin click over the menu, show a custom page (tpl)? can any help me please?

Hello Community, i have my WHMCS system and i want to generate a valid invoice to Ecuador, i have made the service, how do I do when a payment is approved generate consume the service of the SRI (Ecuador's tax agency) and generate a valid invoice? can you help me please?