Plan International has switched to a new system for collecting direct debits.
The international children's charity has adopted Eigerpay Gateway software, which will enable it to utilise a new payment system for processing more than a million regular donations each year.
The change will permit the charity to use new technology, known as BACSTEL-IP, which will replace the current Bacs direct debit system at the end of 2005.
Plan International accountant Hazel Newton said: "We recognised the need to move to BACSTEL-IP, but wanted to ensure that the transition would be quick, efficient and cost-effective.
"Although the move to BACSTEL-IP has been dictated by factors beyond our control, we are now confident that the new technology is robust and highly scalable."
IT experts are warning that charities that do not begin the transition to new technology shortly will face problems after the 2005 deadline.