whole_func_string: function getOrdersStatistics (metricKeys = ['item_sold_minecraft', 'prepaid_card_redeemed_minecraft']) {
    return fetch(`${CORE_API}/orders/statistics`, {
      method: 'POST',
      body: JSON.stringify({metricKeys}),
      headers: {
        'user-agent': USER_AGENT,
        'content-type': 'application/json',
        'accept': 'application/json'
      }
    })
      .then(handleErrors)
      .then(res => res.json())
  }
func_code_string: function getOrdersStatistics (metricKeys = ['item_sold_minecraft', 'prepaid_card_redeemed_minecraft']) {
    return fetch(`${CORE_API}/orders/statistics`, {
      method: 'POST',
      body: JSON.stringify({metricKeys}),
      headers: {
        'user-agent': USER_AGENT,
        'content-type': 'application/json',
        'accept': 'application/json'
      }
    })
      .then(handleErrors)
      .then(res => res.json())
  }
func_documentation_string: Get statistics on the sales of Minecraft.
  
  @param {Array<string>} [metricKeys] - list of metric keys to combine the stats of
  @returns {Promise<{total: number, last24: number, saleVelocityPerSeconds: number}[]>} resolves if metricKeys is provided
  @see {@link http://wiki.vg/Mojang_API#Statistics}