Account linking index structure in a network

A system for constructing an index structure in a real-time payment network, the system configured to:

• receive a first set of transaction information, wherein the first set of transaction information comprises one or more data field entries relating to a user;
• create a data record in the index structure for the user, the data record comprising a plurality of data fields for data field entries;
• insert the one or more data field entries in the first set of transaction information into the data record;
• receive a second set of transaction information, wherein the second set of transaction information comprises one or more data field entries;
• determine if the second set of transaction information is associated with the user, wherein at least one data field entry in the second set of transaction information is different to a corresponding data field entry in the first set of transaction information;
• and
• insert the one or more data field entries in the second set of transaction information into the data record if the second set of transaction information is determined to be associated with the user.

A non-transitory computer-readable storage medium storing instructions thereon which, when executed by a processor, cause the processor to perform a method for constructing an index structure in a real-time payment network, the method comprising:

• receiving a first set of transaction information, wherein the first set of transaction information comprises one or more data field entries relating to a user;
• creating a data record in the index structure for the user, the data record comprising a plurality of data fields for data field entries;
• inserting the one or more data field entries in the first set of transaction information into the data record;
• receiving a second set of transaction information, wherein the second set of transaction information comprises one or more data field entries;
• determining if the second set of transaction information is associated with the user, wherein at least one data field entry in the second set of transaction information is different to a corresponding data field entry in the first set of transaction information;
• and
• inserting the one or more data field entries in the second set of transaction information into the data record if the second set of transaction information is determined to be associated with the user.