Data interaction method and device, and offline credit payment method and device

A system, comprising:

• one or more computers;
• and
• one or more computer memory devices interoperably coupled with the one or more computers and having tangible, non-transitory, machine-readable media storing one or more instructions that, when executed by the one or more computers, perform one or more operations comprising:
• obtaining, by a fee deduction terminal while the fee deduction terminal is offline, and from a mobile device, authorization data for a current interaction, wherein the authorization data comprises signature information, time information of current authorization, a random number of the current authorization, and a threshold, and the authorization data is generated by a remote server and is obtained by the mobile device from the remote server;
• verifying, by the fee deduction terminal while the fee deduction terminal is offline, the signature information in determining whether the authorization data is generated by the remote server;
• in response to at least determining that the authorization data is generated by the remote server, recording, by the fee deduction terminal while the fee deduction terminal is offline, the authorization data and data of the current interaction;
• verifying, by the fee deduction terminal while the fee deduction terminal is offline, the authorization data by performing at least one of:
• comparing the time information comprised in the authorization data with a current time;
• determining whether the random number comprises in the authorization data exists in a previous data interaction;
• or
• determining whether the data of the current interaction exceeds the threshold comprised in the authorization data;
• and
• canceling, by the fee deduction terminal while the fee deduction terminal is offline, the current interaction in response to determining at least one of that:
• the current time is later than the time information comprised in the authorization data,
• the random number comprised in the authorization data exists in the previous data interaction, or
• the data of the current interaction exceeds the threshold comprised in the authorization data.

A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising:

• obtaining, by a fee deduction terminal while the fee deduction terminal is offline, and from a mobile device, authorization data for a current interaction, wherein the authorization data comprises signature information, time information of current authorization, a random number of the current authorization, and a threshold, and the authorization data is generated by a remote server and is obtained by the mobile device from the remote server;
• verifying, by the fee deduction terminal while the fee deduction terminal is offline, the signature information in determining whether the authorization data is generated by the remote server;
• in response to at least determining that the authorization data is generated by the remote server, recording, by the fee deduction terminal while the fee deduction terminal is offline, the authorization data and data of the current interaction;
• verifying, by the fee deduction terminal while the fee deduction terminal is offline, the authorization data by performing at least one of:
• comparing the time information comprised in the authorization data with a current time;
• determining whether the random number comprises in the authorization data exists in a previous data interaction;
• or
• determining whether the data of the current interaction exceeds the threshold comprised in the authorization data;
• and
• canceling, by the fee deduction terminal while the fee deduction terminal is offline, the current interaction in response to determining at least one of that:
• the current time is later than the time information comprised in the authorization data,
• the random number comprised in the authorization data exists in the previous data interaction, or
• the data of the current interaction exceeds the threshold comprised in the authorization data.