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请问退款查询返回的字段，很多带有$n结尾，怎么理解，才能对得上我要查询的退款单？
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{ appid: 'wxe43b****4db9e0d', cash_fee: '16900', mch_id: '153****671', nonce_str: 'ntFcYohOQlVjuNrj', out_refund_no_0: 'REFUND90210422022****495', out_refund_no_1: 'REFUND90210422022****495', out_refund_no_2: 'REFUND90210422022****495', out_refund_no_3: 'REFUND90210422021****495', out_refund_no_4: 'REFUND90210422021****495', out_refund_no_5: 'REFUND90210422022****495', out_refund_no_6: 'REFUND90210422022****495', out_trade_no: '90210****260236495', refund_account_0: 'REFUND_SOURCE_RECHARGE_FUNDS', refund_account_1: 'REFUND_SOURCE_RECHARGE_FUNDS', refund_account_2: 'REFUND_SOURCE_RECHARGE_FUNDS', refund_account_3: 'REFUND_SOURCE_RECHARGE_FUNDS', refund_account_4: 'REFUND_SOURCE_RECHARGE_FUNDS', refund_account_5: 'REFUND_SOURCE_RECHARGE_FUNDS', refund_account_6: 'REFUND_SOURCE_RECHARGE_FUNDS', refund_channel_0: 'ORIGINAL', refund_channel_1: 'ORIGINAL', refund_channel_2: 'ORIGINAL', refund_channel_3: 'ORIGINAL', refund_channel_4: 'ORIGINAL', refund_channel_5: 'ORIGINAL', refund_channel_6: 'ORIGINAL', refund_count: '7', refund_fee: '15400', refund_fee_0: '1950', refund_fee_1: '2950', refund_fee_2: '750', refund_fee_3: '1500', refund_fee_4: '3200', refund_fee_5: '3600', refund_fee_6: '1450', refund_id_0: '5030100792202105010843****244', refund_id_1: '5030100792202105020843****046', refund_id_2: '5030100792202105080862****822', refund_id_3: '5030100792202105080862****403', refund_id_4: '5030100792202105080862****727', refund_id_5: '5030100792202105080862****984', refund_id_6: '5030100792202105080862****520', refund_recv_accout_0: '招商银行信用卡7385', refund_recv_accout_1: '招商银行信用卡7385', refund_recv_accout_2: '招商银行信用卡7385', refund_recv_accout_3: '招商银行信用卡7385', refund_recv_accout_4: '招商银行信用卡7385', refund_recv_accout_5: '招商银行信用卡7385', refund_recv_accout_6: '招商银行信用卡7385', refund_status_0: 'SUCCESS', refund_status_1: 'SUCCESS', refund_status_2: 'SUCCESS', refund_status_3: 'SUCCESS', refund_status_4: 'SUCCESS', refund_status_5: 'SUCCESS', refund_status_6: 'SUCCESS', refund_success_time_0: '2021-05-01 19:56:06', refund_success_time_1: '2021-05-02 07:32:23', refund_success_time_2: '2021-05-08 11:06:56', refund_success_time_3: '2021-05-08 11:07:02', refund_success_time_4: '2021-05-08 11:06:49', refund_success_time_5: '2021-05-08 11:07:08', refund_success_time_6: '2021-05-08 11:00:17', result_code: 'SUCCESS', return_code: 'SUCCESS', return_msg: 'OK', sign: '81FEEA1494E023C5B462DA345D14F889', total_fee: '16900', transaction_id: '4200000****02104196998326642' }
给你拉一个例子，这笔退款单发生了7次部分退款请求，总实收款额 cash_fee=16900，总退款额 refund_fee=15400，refund_count = 7，下标 $n 就是0,1,2,3,5,6，每次退单的商户退单号就是 out_refund_no_$n。
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{ appid: 'wxe43b****4db9e0d', cash_fee: '16900', mch_id: '153****671', nonce_str: 'ntFcYohOQlVjuNrj', out_refund_no_0: 'REFUND90210422022****495', out_refund_no_1: 'REFUND90210422022****495', out_refund_no_2: 'REFUND90210422022****495', out_refund_no_3: 'REFUND90210422021****495', out_refund_no_4: 'REFUND90210422021****495', out_refund_no_5: 'REFUND90210422022****495', out_refund_no_6: 'REFUND90210422022****495', out_trade_no: '90210****260236495', refund_account_0: 'REFUND_SOURCE_RECHARGE_FUNDS', refund_account_1: 'REFUND_SOURCE_RECHARGE_FUNDS', refund_account_2: 'REFUND_SOURCE_RECHARGE_FUNDS', refund_account_3: 'REFUND_SOURCE_RECHARGE_FUNDS', refund_account_4: 'REFUND_SOURCE_RECHARGE_FUNDS', refund_account_5: 'REFUND_SOURCE_RECHARGE_FUNDS', refund_account_6: 'REFUND_SOURCE_RECHARGE_FUNDS', refund_channel_0: 'ORIGINAL', refund_channel_1: 'ORIGINAL', refund_channel_2: 'ORIGINAL', refund_channel_3: 'ORIGINAL', refund_channel_4: 'ORIGINAL', refund_channel_5: 'ORIGINAL', refund_channel_6: 'ORIGINAL', refund_count: '7', refund_fee: '15400', refund_fee_0: '1950', refund_fee_1: '2950', refund_fee_2: '750', refund_fee_3: '1500', refund_fee_4: '3200', refund_fee_5: '3600', refund_fee_6: '1450', refund_id_0: '5030100792202105010843****244', refund_id_1: '5030100792202105020843****046', refund_id_2: '5030100792202105080862****822', refund_id_3: '5030100792202105080862****403', refund_id_4: '5030100792202105080862****727', refund_id_5: '5030100792202105080862****984', refund_id_6: '5030100792202105080862****520', refund_recv_accout_0: '招商银行信用卡7385', refund_recv_accout_1: '招商银行信用卡7385', refund_recv_accout_2: '招商银行信用卡7385', refund_recv_accout_3: '招商银行信用卡7385', refund_recv_accout_4: '招商银行信用卡7385', refund_recv_accout_5: '招商银行信用卡7385', refund_recv_accout_6: '招商银行信用卡7385', refund_status_0: 'SUCCESS', refund_status_1: 'SUCCESS', refund_status_2: 'SUCCESS', refund_status_3: 'SUCCESS', refund_status_4: 'SUCCESS', refund_status_5: 'SUCCESS', refund_status_6: 'SUCCESS', refund_success_time_0: '2021-05-01 19:56:06', refund_success_time_1: '2021-05-02 07:32:23', refund_success_time_2: '2021-05-08 11:06:56', refund_success_time_3: '2021-05-08 11:07:02', refund_success_time_4: '2021-05-08 11:06:49', refund_success_time_5: '2021-05-08 11:07:08', refund_success_time_6: '2021-05-08 11:00:17', result_code: 'SUCCESS', return_code: 'SUCCESS', return_msg: 'OK', sign: '81FEEA1494E023C5B462DA345D14F889', total_fee: '16900', transaction_id: '4200000****02104196998326642' }给你拉一个例子，这笔退款单发生了7次部分退款请求，总实收款额 cash_fee=16900，总退款额 refund_fee=15400，refund_count = 7，下标 $n 就是0,1,2,3,5,6，每次退单的商户退单号就是 out_refund_no_$n。