A payment terminal comprising a merchant device and a payment reader, the payment reader comprising: a communication interface; a payment interface configured to receive payment information from a payment device; a transaction chip configured to operate in a low-power mode and in a transaction processing mode, wherein the transaction chip is configured to exchange the payment information with the payment device during the transaction processing mode, and wherein the transaction chip comprises: a transaction processing unit coupled to the payment interface, wherein the transaction processing unit is configured to execute wake-up instructions and transaction processing instructions; and a transaction processing memory configured to store the wake-up instructions and the transaction processing instructions, wherein the wake-up instructions cause the transaction processing unit to cause the transaction chip to enter the transaction processing mode in response to a wake-up request and wherein the transaction processing instructions cause the transaction processing unit to receive the electronic payment information during the transaction processing mode; and a payment reader chip coupled to the transaction chip, wherein the payment reader chip comprises: a terminal processing unit coupled to the transaction processing unit, wherein the terminal processing unit is configured to execute terminal instructions; and a terminal memory configured to store the terminal instructions, wherein the terminal instructions cause the terminal processing unit to receive a wake-up message, identify wake-up information from the wake-up message, identify a wake-up type based on the wake-up message, identify a wake-up rule based on the wake-up type, and send the wake-up request to the transaction processing unit based on a comparison of the wake-up information to the wake-up rule, characterised in that the communication interface of the payment reader is configured to receive the wake-up message from a device external to the payment reader. a communication interface; a payment interface configured to receive payment information from a payment device; a transaction chip configured to operate in a low-power mode and in a transaction processing mode, wherein the transaction chip is configured to exchange the payment information with the payment device during the transaction processing mode, and wherein the transaction chip comprises: a transaction processing unit coupled to the payment interface, wherein the transaction processing unit is configured to execute wake-up instructions and transaction processing instructions; and a transaction processing memory configured to store the wake-up instructions and the transaction processing instructions, wherein the wake-up instructions cause the transaction processing unit to cause the transaction chip to enter the transaction processing mode in response to a wake-up request and wherein the transaction processing instructions cause the transaction processing unit to receive the electronic payment information during the transaction processing mode; and a transaction processing unit coupled to the payment interface, wherein the transaction processing unit is configured to execute wake-up instructions and transaction processing instructions; and a transaction processing memory configured to store the wake-up instructions and the transaction processing instructions, wherein the wake-up instructions cause the transaction processing unit to cause the transaction chip to enter the transaction processing mode in response to a wake-up request and wherein the transaction processing instructions cause the transaction processing unit to receive the electronic payment information during the transaction processing mode; and a payment reader chip coupled to the transaction chip, wherein the payment reader chip comprises: a terminal processing unit coupled to the transaction processing unit, wherein the terminal processing unit is configured to execute terminal instructions; and a terminal memory configured to store the terminal instructions, wherein the terminal instructions cause the terminal processing unit to receive a wake-up message, identify wake-up information from the wake-up message, identify a wake-up type based on the wake-up message, identify a wake-up rule based on the wake-up type, and send the wake-up request to the transaction processing unit based on a comparison of the wake-up information to the wake-up rule, characterised in that the communication interface of the payment reader is configured to receive the wake-up message from a device external to the payment reader. a terminal processing unit coupled to the transaction processing unit, wherein the terminal processing unit is configured to execute terminal instructions; and a terminal memory configured to store the terminal instructions, wherein the terminal instructions cause the terminal processing unit to receive a wake-up message, identify wake-up information from the wake-up message, identify a wake-up type based on the wake-up message, identify a wake-up rule based on the wake-up type, and send the wake-up request to the transaction processing unit based on a comparison of the wake-up information to the wake-up rule, characterised in that the communication interface of the payment reader is configured to receive the wake-up message from a device external to the payment reader.