After Returning From The Trip

• Hotel invoice
  Credit card receipt for Hotel invoice
  Airfare invoice
  Credit card receipt for Airfare invoice
  Conference registration invoice
  Credit card receipt for conference registration invoice
  Visa invoice
  Credit card receipt for VISA payment
  Visa postal invoice
  Credit card receipt for visa postal payment
  Air/train/bus tickets
  ID card of the conference (Copy is enough)
  Conference registration invoioce
  Credit card receipt of conference registration