API DOCUMENTATION
ENDPOINTS:
/getToken
method : GET
expects : n/a
/getUser
method : POST
expects : user_id
/processPayment
method : POST
expects : nonceFromClient,
amountFromClient
/login
method : POST
expects : email,
password
/signup
method : POST
expects : email,
password
/udpateUser
method : PUT
expects : user_id