A method for securing the processing of transactional data is disclosed. The method is implemented within a communications terminal comprising a transactional data processing module. The method has: a step for the detection, by the processing module, of a display of at least one entry area relating to a piece of payment means data; a step for the activation, by the processing module, of a contactless data reading module; a step for the obtaining, by the contactless data reading module, of at least one piece of payment means data coming from a payment means; and a step for the furnishing, at said at least one entry area, of at least one piece of payment means data previously obtained.