Dan Tolbert

Me

• Electrical Engineer gone Software
• First program was TI-Basic
• First true ❤️ was Python

Why Square

• Been at this for a while 
• Point of sale & e-commerce
• Full inventory and Employee management

Going to cover today

• Application
• Locations
• Customers
• Charging Customers

Application

• Access control to account

Location

• Physical or virtual "location"
• Need a location to do anything fun

Customer

• Exactly like what it sounds... A customer
• Needs standard information...

Charge Transaction

• Needs both a customer AND a location
• Billing Address, shipping address, etc...

Location

Customer

Address, CreditCard?

Address, email, phone number

Transaction

• Credit Card #
• Billing Address
• idempotency key
• Customer id

Questions?