When you sign up, you grant CreditLadder read-only access to see the transactional data in your account.
CreditLadder identifies your rental payment together with the payment reference you supplied. At the end of the month, this is shared with Experian, Equifax, TransUnion and Crediva (depending on which Credit Reference Agencies) you have chosen to report rent to) and is added to your credit file.
Rest assured this is safe and secure and we are regulated by the FCA for the Open Banking technology required to operate this service.