AUTHENTICATION FOR MOBILE PAYMENTS USING SEPARATE SIGNATURES STORED ON AT LEAST ONE EXTERNAL SIGNATURE DEVICE CONTROLLED BY SWAPPABLE PERMISSION MODULES

1 . A system comprising:

a computing device;

a first external signing device wirelessly communicatively coupled to the computing device;

wherein the computing device is configured to:

receive a request to initiate payment from a mobile wallet; and

wirelessly transmit unsigned transaction details to the first external signing device; and

wherein the first external signing device is configured to:

determine whether the unsigned transaction details meet restrictions set by any removable permission module inserted into the first external signing device; and

when the unsigned transaction details meet the restrictions set by any removable permission module inserted into the first external signing device:

wirelessly transmit a first signature to the computing device.

2 . The system of claim 1 , further comprising:

wherein the computing device is configured to:

sign the unsigned transaction using the first signature to generate a first signed transaction; and

submit the first signed transaction to a network.

3 . The system of claim 2 , wherein the computing device is configured to submit the first signed transaction to the network by being configured to:

wirelessly transmit the first signed transaction from the computing device to a payment terminal using near field communication (NFC).

4 . The system of claim 1 , further comprising:

wherein the first external signing device is configured to:

sign the unsigned transaction using the first signature to generate a first signed transaction; and

wirelessly transmit the first signed transaction to the computing device, wherein the first signature is wirelessly transmitted to the computing device in the first signed transaction; and

wherein the computing device is configured to:

submit the first signed transaction to a network.

5 . The system of claim 4 , wherein the computing device is configured to submit the first signed transaction to the network by being configured to:

wirelessly transmit the first signed transaction from the computing device to a payment terminal using near field communication (NFC).

6 . The system of claim 1 , wherein the first external signing device is configured to, when the unsigned transaction details do not meet the restrictions set by any removable permission module inserted into the first external signing device, at least one of:

not wirelessly transmit the first signature to the computing device;

not sign the transaction; and

wirelessly transmit an error message to the computing device.

7 . The system of claim 1 , wherein the first external signing device is configured to:

determine whether the computing device is paired with the first external signing device;

only wirelessly transmit the first signature to the computing device when the computing device is determined to be paired with the first external signing device.

8 . The system of claim 7 , wherein the first external signing device is configured to, when the computing device is not determined to be paired with the first external signing device, at least one of:

not wirelessly transmit the first signature to the computing device;

not sign the transaction; and

wirelessly transmit an error message to the computing device.

9 . The system of claim 1 , further comprising:

a second external signing device wirelessly communicatively coupled to the computing device;

wherein the computing device is further configured to:

wirelessly transmit the unsigned transaction details to the second external signing device;

wherein the second external signing device is configured to:

determine whether the unsigned transaction details meet restrictions set by any removable permission module inserted into the second external signing device;

when the unsigned transaction details meet the restrictions set by any removable permission module inserted into the second external signing device:

wirelessly transmit a second signature to the computing device.

10 . The system of claim 1 , wherein the computing device is a mobile computing device.

11 . A method comprising:

receiving a request to initiate payment from a mobile wallet at a computing device;

wirelessly transmitting unsigned transaction details to a first external signing device from the computing device;

determining whether the unsigned transaction details meet restrictions set by any removable permission module inserted into the first external signing device; and

when the unsigned transaction details meet the restrictions set by any removable permission module inserted into the first external signing device:

wirelessly transmit a first signature to the computing device from the first external signing device.

12 . The method of claim 11 , further comprising:

signing the unsigned transaction using the first signature to generate a first signed transaction at the computing device or the first external signing device; and

submitting the first signed transaction to a network from the computing device.

13 . The method of claim 12 , wherein submitting the first signed transaction to the network includes:

wirelessly transmitting the first signed transaction from the computing device to a payment terminal using near field communication (NFC).

14 . The method of claim 11 , further comprising:

when the unsigned transaction details do not meet the restrictions set by any removable permission module inserted into the first external signing device, at least one of:

not wirelessly transmitting the first signature from the first external signing device to the computing device;

not signing the transaction; and

wirelessly transmitting an error message from the first external signing device to the computing device.

15 . The method of claim 11 , further comprising:

determining whether the computing device is paired with the first external signing device; and

only wirelessly transmitting the first signature to the computing device when the computing device is determined to be paired with the first external signing device.

16 . The method of claim 15 , further comprising:

when the computing device is not determined to be paired with the first external signing device, at least one of:

not wirelessly transmitting the first signature to the computing device;

not signing the transaction; and

wirelessly transmitting an error message to the computing device from the first external signing device.

17 . The method of claim 11 , further comprising:

wireless transmitting the unsigned transaction details to a second external signing device from the computing device;

determining whether the unsigned transaction details meet restrictions set by any removable permission module inserted into the second external signing device;

when the unsigned transaction details meet the restrictions set by any removable permission module inserted into the second external signing device:

wirelessly transmitting a second signature to the computing device from the second external signing device.

18 . The method of claim 11 , wherein the computing device is a mobile computing device.

19 . An external signing device comprising:

at least one processor;

at least one memory communicatively coupled to the at least one processor;

at least one wireless communication device communicatively coupled to the at least one processor and an antenna;

at least one removable permission module slot communicatively coupled to the at least one processor;

wherein the at least one wireless communication device is configured to wirelessly receive unsigned transaction details from a computing device through the antenna;

wherein the at least one processor is configured to:

receive the unsigned transaction details from the at least one wireless communication device;

determine whether the unsigned transaction details meet restrictions set by any removable permission module inserted into the at least one removable permission module slot;

when the unsigned transaction details meet the restrictions set by any removable permission module inserted into the at least one removable permission module slot, cause the at least one wireless communication device to wirelessly transmit a first signature to the computing device.

20 . The external signing device of claim 19 , wherein the at least one wireless communication device is a near field communication (NFC) radio.