How can we make a website/app like PayPal or any other payment system

Question

Which technology should we use is there any resources and link

Answer 1

https://www.sololearn.com/discuss/1945119/?ref=app
https://www.sololearn.com/discuss/2331632/?ref=app
https://www.sololearn.com/discuss/146977/?ref=app
https://www.sololearn.com/discuss/2350935/?ref=app
https://www.sololearn.com/discuss/372529/?ref=app
https://www.sololearn.com/discuss/400435/?ref=app
https://www.sololearn.com/discuss/1117732/?ref=app
https://www.sololearn.com/discuss/34298/?ref=app
https://www.sololearn.com/discuss/1913649/?ref=app
https://www.sololearn.com/discuss/2083409/?ref=app
https://www.sololearn.com/discuss/129519/?ref=app