Hello, I am developing a hosting billing software, Can you suggest me some points which can be helpful? Our developers are working but need some suggestion that which features must for a normal basic billing software in starting? I am not going to release it for public use unless it will be audited by good security company but need some suggestion. - Security tips (Like which is best company for security audit?) - Improvement tips - Software upgrade tips (Like how can I monitor software changes, upgrade, file changes in new version, Any good software which monitor this?) - Pricing - Any other suggestion? update: - @Mods: Seems I posted this in wrong section, If I am correct then please move it to correct section. Thanks.