Admin account:
  username: admin@bookshop.com
  password: hTf7oU2ZC720SZwK
  
Cusomer account:
  username: user1@bookshop.com
  password: X9DuW72VJiovMlle
  
  username: user2@bookshop.com
  password: nOFPSNr3P96O6DPR
  
All URLs:
  GET     /cart 
  POST    /cart 
  PUT     /cart 
  DELETE  /cart/from/{userId} 
  GET     /cart/from/{userId} 
  GET     /cart/items/{userId} 
  DELETE  /cart/{id} 
  GET     /cart/{id} 
  GET     /item 
  POST    /item 
  PUT     /item 
  DELETE  /item/{id} 
  GET     /item/{id} 
  GET     /order 
  POST    /order 
  PUT     /order 
  GET     /order/latest/{userId} 
  DELETE  /order/{id} 
  GET     /order/{id}
  GET     /user 
  POST    /user 
  PUT     /user 
  GET     /user/authenticate 
  GET     /user/email/{email} 
  DELETE  /user/{id} 
  GET     /user/{id}