A. Money transfer through IMPS could be construed reliable evidence of proof as electronic transaction.
B. Mere transfer the money through IMPS would not sufficient proof to establish grant of loan. It shows there was financial transaction between you and your friend. However, the said financial transactions shall be prove that you transferred the money to your friend as loan which was transferred by you.
C. You can issue a legal notice through E-mail or whatsapp or Registered Post with acknowledgement to repay the loan amount
D. You should collect all the electronic transaction records including sms, whatsapp and facebook chat or phone conversation records to establish your case towards loan sanction by you.