Where did you made donation ?
For Print Receipt - Donations made through this Portal
Receipt generation for UPI , NetBanking, Debit Card, Credit Card transactions done on this platform is instantaneous. However, while you were doing the transaction if there was an interruption, the bank gateway might not update your credit information to CMDRF. In such cases you may have to wait for receipt generation for one or two more days till the bank update your transaction to CMDRF.
includes RTGS, NEFT, UPI/VPA, QR code etc