Nowa

my developer wrote me this:
"You were completely dependent on third party plateform i.e nowa and I was experienced in working with Nowa, but you also need to understand that I don’t own or control the platform. If there are any technical issues or limitations with Nowa itself, it’s something neither you nor I can fix directly. As I shared with you earlier, Nowa has acknowledged the issues on their end."

Result: project is lost, money gone, market opportunity missed.

Lesson learned: If you about to professionally develop a project make sure that you're in total control of all steps and technology.