| CPC H04L 63/08 (2013.01) [G06F 9/546 (2013.01); G06Q 40/04 (2013.01); H04L 67/02 (2013.01)] | 20 Claims |

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1. A computer-implemented method performed on a data processing apparatus comprising:
generating, by a connector computing device, a set of transfer conditions in response to a request for transfer conditions;
generating, by the connector computing device, a message authentication code based on a portion of data from the set of transfer conditions;
storing, by the connector computing device, the message authentication code in the set of transfer conditions;
sending, by the connector computing device, the request for transfer conditions to a first computing device;
receiving, by the connector computing device, from the first computing device, the set of transfer conditions and an indication of an acceptance of the set of transfer conditions by a second computing device;
generating, by the connector computing device, a new message authentication code from the portion of data from the set of transfer conditions received from the first computing device;
comparing, by the connector computing device, the new message authentication code to the message authentication code and determining that the new message authentication code does not match the message authentication code; and
in response to determining that the new message authentication code does not match the message authentication code, resending, by the connector computing device, the set of transfer conditions to the first computing device.
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