Hi Chatambudza,
Hope you are doing well !!
I notices that you are looking to develop Payment gateway like Paypal. I am glad to share that I 5 years of experience with Java, I worked for payment gateway company as a tech lead, so I know each and every concept of payment gateway like, payment processor, methods, regulations and all. I am excited and I will be best fit for this job and can help you to develop a best product.
There are so many things which I would like to discuss with you.
Eagerly waiting to hear from you soon.
Kind Regards,
Vishal