Hello, How are you?
I have just read your job description carefully and visit your shared link.
I'm a senior developer and I have full experience of more than +7 years in this fields.
I have an expertise of PHP, JavaScript, Reat, Ruby, Angular...etc
And I have enough experience of Payment Gateway using Paypal, Stripe, Brain Tree...etc
So I can provide you perfect result as you want.
We can use the OTP(One Time Password) to verification with 4~6 digit.
By the way, what kind of server do you going to use?
AWS or GCP, Goddady...etc?
And what kind of email server do you going to use?
Send Grid or MailGun...etc?
Hope to discuss about your project more details over chat.
Looking for your kind reply.
Thanks for your attention.
Best Regards.
Freelancer Gui,