def user_transactions(params = {})
      request(:post, '/user_transactions', params).each { |t| t.id = t.id.to_s }
    end
def user_transactions(params = {})
      request(:post, '/user_transactions', params).each { |t| t.id = t.id.to_s }
    end
Return a list of user transactions.

 offset - optional, skip that many transactions before beginning to return results. Default: 0.
 limit  - optional, limit result to that many transactions. Default: 50.
 sort   - optional, sorting by date and time (asc - ascending; desc - descending). Default: desc.
 book   - optional, if not specified, will default to btc_cad.