Update Salesforce Schema

  1. Open Setup>Object Manager from the upper menu options.
  2. Click on the Account.
  3. Click on the Fields & Relationships.
  4. Use the New button to create
    Type Label Length Field Name
    Text Company 50 BillingCompany
    Text Email Address 100 BillingEmail
    Text First Name 30 BillingFirstName
    Text Last Name 30 BillingLastName

    The "_c" will be added to the Field Name to show that it is a customized field and will be used for API Name.