Well, I built a picture converter from scratch in 250 hours. It has a fully functional conversion system converting images to 9 different formats, it has a pay

Well, I built a picture converter from scratch in 250 hours. It has a fully functional conversion system converting images to 9 different formats, it has a payment system and monthly subscription system through Stripe, it has its own custom REST api build from scratch to give access to other developers to use in their apps, and it has conversion tracking and measures in place to prevent abuse, to the best of my ability. The above is why I feel confident about this project as it is nothing I haven't seen before. I do agree about the sensitive data and payment info. Would that still apply given that I immersed myself in security for this specific purpose and do not actually keep anything on server? Stripe handles everything and it's all carefully encrypted. Maybe I'm missing something. And yes, this will be a flat fee. I'm trying to get to a flat fee based on an hourly estimate + rates. In that regard, would you have a recommendation?