This is the response you will get when customer's card has been charged successfully.You could use some of the data below for logging purposes.

{ id: 'ch_103qzW2eZvKYlo2CiYcKs6Sw',
  object: 'charge',
  created: 1397510564,
  livemode: false,
  paid: true,
  amount: 395,
  currency: 'usd',
  refunded: false,
  card:
    { id: 'card_103qzW2eZvKYlo2CJ2Ss4kwS',
      object: 'card',
      last4: '4242',
      type: 'Visa',
      exp_month: 11,
      exp_year: 2015,
      fingerprint: 'Xt5EWLLDS7FJjR1c',
      customer: null,
      country: 'US',
      name: 'sahat@me.com',
      address_line1: null,
      address_line2: null,
      address_city: null,
      address_state: null,
      address_zip: null,
      address_country: null,
      cvc_check: 'pass',
      address_line1_check: null,
      address_zip_check: null },
  captured: true,
  refunds: [],
  balance_transaction: 'txn_103qzW2eZvKYlo2CNEcJV8SN',
  failure_message: null,
  failure_code: null,
  amount_refunded: 0,
  customer: null,
  invoice: null,
  description: 'sahat@me.com',
  dispute: null,
  metadata: {},
  statement_description: null }