Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 Sample Contracts

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (June 23rd, 2004)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 04/2003 DISTRIBUTION REPORT SERIES: wamu 2002-ar8 WEIGHTED AVERAGE PC RATE: 5.45256% POOL NUMBER: Group 1 = 1888 ____________________________________________________________________________________________ ISSUE DATE: 07/25/2002 CERTIFICATE BALANCE AT ISSUE: $1,493,632,954.00 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (June 23rd, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated July 23, 2002 to that certain Prospectus Supplement, dated July 23, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (June 23rd, 2004)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 02/2003 DISTRIBUTION REPORT SERIES: wamu 2002-ar8 WEIGHTED AVERAGE PC RATE: 5.46463% POOL NUMBER: Group 1 = 1888 ____________________________________________________________________________________________ ISSUE DATE: 07/25/2002 CERTIFICATE BALANCE AT ISSUE: $1,493,632,954.00 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (June 23rd, 2004)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 03/2003 DISTRIBUTION REPORT SERIES: wamu 2002-ar8 WEIGHTED AVERAGE PC RATE: 5.45837% POOL NUMBER: Group 1 = 1888 ____________________________________________________________________________________________ ISSUE DATE: 07/25/2002 CERTIFICATE BALANCE AT ISSUE: $1,493,632,954.00 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (June 4th, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated July 23, 2002 to that certain Prospectus Supplement, dated July 23, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (May 4th, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated July 23, 2002 to that certain Prospectus Supplement, dated July 23, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (April 5th, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated July 23, 2002 to that certain Prospectus Supplement, dated July 23, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (March 3rd, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated July 23, 2002 to that certain Prospectus Supplement, dated July 23, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (February 4th, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated July 23, 2002 to that certain Prospectus Supplement, dated July 23, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (January 7th, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated July 23, 2002 to that certain Prospectus Supplement, dated July 23, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (December 4th, 2003)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated July 23, 2002 to that certain Prospectus Supplement, dated July 23, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (November 4th, 2003)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated July 23, 2002 to that certain Prospectus Supplement, dated July 23, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (October 9th, 2003)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated July 23, 2002 to that certain Prospectus Supplement, dated July 23, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (September 4th, 2003)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated July 23, 2002 to that certain Prospectus Supplement, dated July 23, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (August 11th, 2003)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 07/2003 DISTRIBUTION REPORT SERIES: wamu 2002-ar8 WEIGHTED AVERAGE PC RATE: 5.43908% POOL NUMBER: Group 1 = 1888 ____________________________________________________________________________________________ ISSUE DATE: 07/25/2002 CERTIFICATE BALANCE AT ISSUE: $1,493,632,954.00 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (July 7th, 2003)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 06/2003 DISTRIBUTION REPORT SERIES: wamu 2002-ar8 WEIGHTED AVERAGE PC RATE: 5.44394% POOL NUMBER: Group 1 = 1888 ____________________________________________________________________________________________ ISSUE DATE: 07/25/2002 CERTIFICATE BALANCE AT ISSUE: $1,493,632,954.00 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (June 10th, 2003)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 05/2003 DISTRIBUTION REPORT SERIES: wamu 2002-ar8 WEIGHTED AVERAGE PC RATE: 5.44764% POOL NUMBER: Group 1 = 1888 ____________________________________________________________________________________________ ISSUE DATE: 07/25/2002 CERTIFICATE BALANCE AT ISSUE: $1,493,632,954.00 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (January 3rd, 2003)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 12/2002 DISTRIBUTION REPORT SERIES: wamu 2002-ar8 WEIGHTED AVERAGE PC RATE: 5.47766% POOL NUMBER: Group 1 = 1888 ____________________________________________________________________________________________ ISSUE DATE: 07/25/2002 CERTIFICATE BALANCE AT ISSUE: $1,493,632,954.00 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (December 9th, 2002)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 11/2002 DISTRIBUTION REPORT SERIES: wamu 2002-ar8 WEIGHTED AVERAGE PC RATE: 5.48580% POOL NUMBER: Group 1 = 1888 ____________________________________________________________________________________________ ISSUE DATE: 07/25/2002 CERTIFICATE BALANCE AT ISSUE: $1,493,632,954.00 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (November 8th, 2002)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 10/2002 DISTRIBUTION REPORT SERIES: wamu 2002-ar8 WEIGHTED AVERAGE PC RATE: 5.49274% POOL NUMBER: Group 1 = 1888 ____________________________________________________________________________________________ ISSUE DATE: 07/25/2002 CERTIFICATE BALANCE AT ISSUE: $1,493,632,954.00 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (October 7th, 2002)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 09/2002 DISTRIBUTION REPORT SERIES: wamu 2002-ar8 WEIGHTED AVERAGE PC RATE: 5.50562% POOL NUMBER: Group 1 = 1888 ____________________________________________________________________________________________ ISSUE DATE: 07/25/2002 CERTIFICATE BALANCE AT ISSUE: $1,493,632,954.00 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (September 10th, 2002)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 08/2002 DISTRIBUTION REPORT SERIES: wamu 2002-ar9 WEIGHTED AVERAGE PC RATE: 4.09540% POOL NUMBER: Group 1 = 1889 ____________________________________________________________________________________________ ISSUE DATE: 07/26/2002 CERTIFICATE BALANCE AT ISSUE: $872,554,785.81 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Mort Sec Corp Mort Pas Thr Cer Se 2002-Ar8 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP., (August 8th, 2002)

EXECUTION VERSION WASHINGTON MUTUAL MORTGAGE SECURITIES CORP., as Depositor and Master Servicer and DEUTSCHE BANK NATIONAL TRUST COMPANY, as Trustee and DEUTSCHE BANK TRUST COMPANY DELAWARE, as Delaware Trustee POOLING AND SERVICING AGREEMENT $1,493,632,954.72 Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR8 Cut-Off Date: July 1, 2002 TABLE OF CONTENTS