Method and device facilitating expansion of primary payment instruments

A device for generating primary payment keys for primary payment instruments, comprising:

• one or more processors;
• and
• one or more computer-readable memories coupled to the one or more processors and configured with instructions executable by the one or more processors to cause the device to:
• determine a type of a primary payment instrument;
• determine, from a set of primary key generation rules, a primary key generation rule corresponding to the type of the primary payment instrument;
• acquire, according to the determined primary key generation rule, a list of primary payment instrument elements of the primary payment instrument;
• sort the primary payment instrument elements according to an order specified by the primary key generation rule;
• generate, according to a hash algorithm, first cyphertext of the sorted primary payment instrument elements as a first primary payment key for the primary payment instrument;
• acquire a new primary payment instrument element of the primary payment instrument;
• update, based on the new primary payment instrument element of the primary payment instrument, the primary key generation rule for the primary payment instrument;
• generate an updated list by adding the new primary payment instrument element to the end of the list of primary payment instrument elements such that the new primary payment instrument element is the last in the updated list;
• generate, according to the hash algorithm, second cyphertext of the updated list as a second primary payment key for the primary payment instrument;
• store a corresponding relationship between the primary payment instrument and the first primary payment key and the second primary payment key;
• and
• provide a response to an inquiry about the primary payment instrument based on the stored corresponding relationship.

A non-transitory computer-readable storage medium storing instructions executable by a processor to cause the processor to perform operations comprising:

• determining a type of a primary payment instrument;
• determining, from a set of primary key generation rules, a primary key generation rule corresponding to the type of the primary payment instrument;
• acquiring, according to the determined primary key generation rule, a list of primary payment instrument elements of the primary payment instrument;
• sorting the primary payment instrument elements according to an order specified by the primary key generation rule;
• generating, according to a hash algorithm, first cyphertext of the sorted primary payment instrument elements as a first primary payment key for the primary payment instrument;
• acquiring a new primary payment instrument element of the primary payment instrument;
• updating, based on the new primary payment instrument element of the primary payment instrument, the primary key generation rule for the primary payment instrument;
• generating an updated list by adding the new primary payment instrument element to the end of the list of primary payment instrument elements such that the new primary payment instrument element is the last in the updated list;
• generating according to the hash algorithm, second cyphertext of the updated list as a second primary payment key for the primary payment instrument;
• storing a corresponding relationship between the primary payment instrument and the first primary payment key and the second primary payment key;
• and
• providing a response to an inquiry about the primary payment instrument based on the stored corresponding relationship.