AUTOMATED MULTI-CURRENCY REFUND SERVICE

1 . A computer-implemented method for multi-currency refund service processing comprising:

receiving a refund request for a target transaction;

in response to receiving the refund request, determining a pre-stored historical record of the target transaction;

calculating a received refund amount of a current refund based on a total received refund amount in the historical record and a payable refund amount specified in the refund request;

determining a rounding policy of the current refund and calculating a rounding difference based on a calculated paid refund amount;

updating the total received refund amount in the historical record by using the calculated rounding difference; and

generating a multi-currency refund service of the target transaction to be processed based on an updated total received refund amount.

2 . The computer-implemented method of claim 1 , wherein calculating the received refund amount of the current refund based on the total received refund amount in the historical record and the payable refund amount specified in the refund request comprises:

obtaining a receivable payment amount P and a received payment amount R of the target transaction and a total receivable refund amount r Σ and a total received refund amount p Σ of historical refunds from the historical record;

obtaining a receivable refund amount r k specified in the refund request; and

calculating the received refund amount p k of the current refund based on a principle that a payer amount proportion is equal to a payee amount proportion, wherein the payer amount proportion is

p

k

+

p

Σ

P

,

and the payee amount proportion is

r

k

+

r

Σ

R

.

3 . The computer-implemented method of claim 2 , wherein determining the pre-stored historical record of the target transaction comprises:

obtaining an ID of the target transaction comprised in the refund request; and

searching a pre-stored full transaction historical record for the historical record of the target transaction based on the obtained ID.

4 . The computer-implemented method of claim 3 , wherein obtaining the receivable payment amount P and the received payment amount R of the target transaction from the historical record comprises:

obtaining the receivable payment amount P and the received payment amount R of the target transaction from transaction information in the historical record of the target transaction.

5 . The computer-implemented method of claim 3 , wherein obtaining the total receivable refund amount r Σ and the total received refund amount p Σ of the historical refunds from the historical record comprises:

determining each piece of refund information of the historical refunds of the target transaction from the historical record of the target transaction;

for each piece of the refund information, obtaining a receivable refund amount and a received refund amount of a current historical refund; and

calculating a sum of obtained receivable refund amounts of the historical refunds as the total receivable refund amount r 93 , and calculating a sum of obtained received refund amounts of the historical refunds as the total received refund amount p Σ .

6 . The computer-implemented method of claim 3 , wherein obtaining the total receivable refund amount r Σ and the total received refund amount p Σ of the historical refunds from the historical record comprises:

determining accumulated historical refund information of the target transaction from the historical record of the target transaction; and

obtaining the total receivable refund amount r Σ and the total received refund amount p Σ of the historical refunds of the target transaction from the determined accumulated historical refund information.

7 . The computer-implemented method of claim 2 , wherein obtaining the total receivable refund amount r Σ and the total received refund amount p Σ of the historical refunds from the historical record comprises:

determining, based on the refund request, whether the target transaction satisfies a predetermined trigger condition; and

if the target transaction does not satisfy the predetermined trigger condition, obtaining the total receivable refund amount r Σ and the total received refund amount p Σ both with a value of 0; or

if the target transaction satisfies the predetermined trigger condition, obtaining the total receivable refund amount r Σ and the total received refund amount p Σ of the historical refunds from the historical record.

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

receiving a refund request for a target transaction;

in response to receiving the refund request, determining a pre-stored historical record of the target transaction;

calculating a received refund amount of a current refund based on a total received refund amount in the historical record and a payable refund amount specified in the refund request;

determining a rounding policy of the current refund and calculating a rounding difference based on a calculated paid refund amount;

updating the total received refund amount in the historical record by using the calculated rounding difference; and

generating a multi-currency refund service of the target transaction to be processed based on an updated total received refund amount.

9 . The non-transitory, computer-readable medium of claim 8 , wherein calculating the received refund amount of the current refund based on the total received refund amount in the historical record and the payable refund amount specified in the refund request comprises:

obtaining a receivable payment amount P and a received payment amount R of the target transaction and a total receivable refund amount r Σ and a total received refund amount p Σ of historical refunds from the historical record;

obtaining a receivable refund amount r k specified in the refund request; and

calculating the received refund amount p k of the current refund based on a principle that a payer amount proportion is equal to a payee amount proportion, wherein the payer amount proportion is

p

k

+

p

Σ

P

,

and the payee amount proportion is

r

k

+

r

Σ

R

.

10 . The non-transitory, computer-readable medium of claim 9 , wherein determining the pre-stored historical record of the target transaction comprises:

obtaining an ID of the target transaction comprised in the refund request; and

searching a pre-stored full transaction historical record for the historical record of the target transaction based on the obtained ID.

11 . The non-transitory, computer-readable medium of claim 10 , wherein obtaining the receivable payment amount P and the received payment amount R of the target transaction from the historical record comprises:

obtaining the receivable payment amount P and the received payment amount R of the target transaction from transaction information in the historical record of the target transaction.

12 . The non-transitory, computer-readable medium of claim 10 , wherein obtaining the total receivable refund amount r Σ and the total received refund amount p Σ of the historical refunds from the historical record comprises:

determining each piece of refund information of the historical refunds of the target transaction from the historical record of the target transaction;

for each piece of the refund information, obtaining a receivable refund amount and a received refund amount of a current historical refund; and

calculating a sum of obtained receivable refund amounts of the historical refunds as the total receivable refund amount r Σ , and calculating a sum of obtained received refund amounts of the historical refunds as the total received refund amount p Σ .

13 . The non-transitory, computer-readable medium of claim 10 , wherein obtaining the total receivable refund amount r Σ and the total received refund amount p Σ of the historical refunds from the historical record comprises:

determining accumulated historical refund information of the target transaction from the historical record of the target transaction; and

obtaining the total receivable refund amount r Σ and the total received refund amount p Σ of the historical refunds of the target transaction from the determined accumulated historical refund information.

14 . The non-transitory, computer-readable medium of claim 9 , wherein obtaining the total receivable refund amount r Σ and the total received refund amount p Σ of the historical refunds from the historical record comprises:

determining, based on the refund request, whether the target transaction satisfies a predetermined trigger condition; and

if the target transaction does not satisfy the predetermined trigger condition, obtaining the total receivable refund amount r Σ and the total received refund amount p Σ both with a value of 0; or

if the target transaction satisfies the predetermined trigger condition, obtaining the total receivable refund amount r Σ and the total received refund amount p Σ of the historical refunds from the historical record.

15 . A computer-implemented 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:

receiving a refund request for a target transaction;

in response to receiving the refund request, determining a pre-stored historical record of the target transaction;

calculating a received refund amount of a current refund based on a total received refund amount in the historical record and a payable refund amount specified in the refund request;

determining a rounding policy of the current refund and calculating a rounding difference based on a calculated paid refund amount;

updating the total received refund amount in the historical record by using the calculated rounding difference; and

generating a multi-currency refund service of the target transaction to be processed based on an updated total received refund amount.

16 . The computer-implemented system of claim 15 , wherein calculating the received refund amount of the current refund based on the total received refund amount in the historical record and the payable refund amount specified in the refund request comprises:

obtaining a receivable payment amount P and a received payment amount R of the target transaction and a total receivable refund amount r Σ and a total received refund amount p Σ of historical refunds from the historical record;

obtaining a receivable refund amount r k specified in the refund request; and

calculating the received refund amount p k of the current refund based on a principle that a payer amount proportion is equal to a payee amount proportion, wherein the payer amount proportion is

p

k

+

p

Σ

P

,

and the payee amount proportion is

r

k

+

r

Σ

R

.

17 . The computer-implemented system of claim 16 , wherein determining the pre-stored historical record of the target transaction comprises:

obtaining an ID of the target transaction comprised in the refund request; and

searching a pre-stored full transaction historical record for the historical record of the target transaction based on the obtained ID.

18 . The computer-implemented system of claim 17 , wherein obtaining the receivable payment amount P and the received payment amount R of the target transaction from the historical record comprises:

obtaining the receivable payment amount P and the received payment amount R of the target transaction from transaction information in the historical record of the target transaction.

19 . The computer-implemented system of claim 17 , wherein obtaining the total receivable refund amount r Σ and the total received refund amount p Σ of the historical refunds from the historical record comprises:

determining each piece of refund information of the historical refunds of the target transaction from the historical record of the target transaction;

for each piece of the refund information, obtaining a receivable refund amount and a received refund amount of a current historical refund; and

calculating a sum of obtained receivable refund amounts of the historical refunds as the total receivable refund amount r Σ and calculating a sum of obtained received refund amounts of the historical refunds as the total received refund amount p Σ .

20 . The computer-implemented system of claim 17 , wherein obtaining the total receivable refund amount r Σ and the total received refund amount p Σ of the historical refunds from the historical record comprises:

determining accumulated historical refund information of the target transaction from the historical record of the target transaction; and

obtaining the total receivable refund amount r Σ and the total received refund amount p Σ of the historical refunds of the target transaction from the determined accumulated historical refund information.

21 . The computer-implemented system of claim 16 , wherein obtaining the total receivable refund amount r Σ and the total received refund amount p Σ of the historical refunds from the historical record comprises:

determining, based on the refund request, whether the target transaction satisfies a predetermined trigger condition; and

if the target transaction does not satisfy the predetermined trigger condition, obtaining the total receivable refund amount r Σ and the total received refund amount p Σ both with a value of 0; or

if the target transaction satisfies the predetermined trigger condition, obtaining the total receivable refund amount r Σ and the total received refund amount p Σ of the historical refunds from the historical record.