403 error after PayPayl payment

This is what my root access looks like:

# BULLETPROOF .51.3 >>>>>>> SECURE .HTACCESS

# CUSTOM CODE TOP PHP/PHP.INI HANDLER/CACHE CODE
# BEGIN WEBSITE SPEED BOOST
# Time cheat sheet in seconds
# A86400 = 1 day
# A172800 = 2 days
# A2419200 = 1 month
# A4838400 = 2 months
# A29030400 = 1 year

# Test which ETag setting works best on your Host/Server/Website
# with Firefox Firebug, Firephp and Yslow benchmark tests.

# Create the ETag (entity tag) response header field
#FileETag MTime Size

# Remove the ETag (entity tag) response header field
Header unset ETag
FileETag none

<IfModule mod_expires.c>
ExpiresActive on
ExpiresByType image/jpg A4838400
ExpiresByType image/gif A4838400
ExpiresByType image/jpeg A4838400
ExpiresByType image/png A4838400
ExpiresByType video/webm A4838400
ExpiresByType application/x-shockwave-flash A4838400
ExpiresByType application/x-javascript A4838400
ExpiresByType application/javascript A4838400
ExpiresByType text/javascript A4838400
ExpiresByType text/css A4838400
#ExpiresByType text/html A86400
# Default is 2 days below so the line above is not needed / commented out
ExpiresDefault A172800
</IfModule>

<IfModule mod_headers.c>
<FilesMatch “\.(js|css|flv|ico|pdf|avi|mov|ppt|doc|mp3|wmv|wav|gif|jpg|jpeg|png|swf|webm)$”>
Header append Cache-Control “public”
</FilesMatch>
<FilesMatch “\.(txt|html)$”>
Header append Cache-Control “proxy-revalidate”
</FilesMatch>
<FilesMatch “\.(php|cgi|pl|htm|xml)$”>
Header set Cache-Control “private, no-cache, no-store, proxy-revalidate, no-transform”
Header set Pragma “no-cache”
</FilesMatch>
</IfModule>

<IfModule mod_deflate.c>
# Insert filters
AddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/xml
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE application/xml
AddOutputFilterByType DEFLATE application/xhtml+xml
AddOutputFilterByType DEFLATE application/rss+xml
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/x-javascript
AddOutputFilterByType DEFLATE application/x-httpd-php
AddOutputFilterByType DEFLATE application/x-httpd-fastphp
AddOutputFilterByType DEFLATE image/svg+xml

# Drop problematic browsers
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html

# Make sure proxies don’t deliver the wrong content
Header append Vary User-Agent env=!dont-vary
</IfModule>
# END WEBSITE SPEED BOOST

<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off
</IfModule>

# TURN OFF YOUR SERVER SIGNATURE
# Suppresses the footer line server version number and ServerName of the serving virtual host
ServerSignature Off

# DO NOT SHOW DIRECTORY LISTING
# Disallow mod_autoindex from displaying a directory listing
# If a 500 Internal Server Error occurs when activating Root BulletProof Mode
# copy the entire DO NOT SHOW DIRECTORY LISTING and DIRECTORY INDEX sections of code
# and paste it into BPS Custom Code and comment out Options -Indexes
# by adding a # sign in front of it.
# Example: #Options -Indexes
Options -Indexes

# DIRECTORY INDEX FORCE INDEX.PHP
# Use index.php as default directory index file. index.html will be ignored.
# If a 500 Internal Server Error occurs when activating Root BulletProof Mode
# copy the entire DO NOT SHOW DIRECTORY LISTING and DIRECTORY INDEX sections of code
# and paste it into BPS Custom Code and comment out DirectoryIndex
# by adding a # sign in front of it.
# Example: #DirectoryIndex index.php index.html /index.php
DirectoryIndex index.php index.html /index.php

# BRUTE FORCE LOGIN PAGE PROTECTION
# PLACEHOLDER ONLY
# Use BPS Custom Code to add Brute Force Login protection code and to save it permanently.
# See this link: http://forum.ait-pro.com/forums/topic/protect-login-page-from-brute-force-login-attacks/
# for more information.

# BPS PRO ERROR LOGGING AND TRACKING
# Use BPS Custom Code to modify/edit/change this code and to save it permanently.
# BPS has premade 403 Forbidden, 400 Bad Request and 404 Not Found files that are used
# to track and log 403, 400 and 404 errors that occur on your website. When a hacker attempts to
# hack your website the hackers IP address, Host name, Request Method, Referering link, the file name or
# requested resource, the user agent of the hacker and the query string used in the hack attempt are logged.
# All BPS log files are htaccess protected so that only you can view them.
# The 400.php, 403.php and 404.php files are located in /wp-content/plugins/bulletproof-security/
# The 400 and 403 Error logging files are already set up and will automatically start logging errors
# after you install BPS and have activated BulletProof Mode for your Root folder.
# If you would like to log 404 errors you will need to copy the logging code in the BPS 404.php file
# to your Theme’s 404.php template file. Simple instructions are included in the BPS 404.php file.
# You can open the BPS 404.php file using the WP Plugins Editor.
# NOTE: By default WordPress automatically looks in your Theme’s folder for a 404.php Theme template file.

ErrorDocument 400 /wp-content/plugins/bulletproof-security/400.php
ErrorDocument 401 default
ErrorDocument 403 /wp-content/plugins/bulletproof-security/403.php
ErrorDocument 404 /404.php

# DENY ACCESS TO PROTECTED SERVER FILES AND FOLDERS
# Use BPS Custom Code to modify/edit/change this code and to save it permanently.
# Files and folders starting with a dot: .htaccess, .htpasswd, .errordocs, .logs
RedirectMatch 403 \.(htaccess|htpasswd|errordocs|logs)$

# WP-ADMIN/INCLUDES
# Use BPS Custom Code to remove this code permanently.
RewriteEngine On
RewriteBase /
RewriteRule ^wp-admin/includes/ – [F]
RewriteRule !^wp-includes/ – [S=3]
RewriteRule ^wp-includes/[^/]+\.php$ – [F]
RewriteRule ^wp-includes/js/tinymce/langs/.+\.php – [F]
RewriteRule ^wp-includes/theme-compat/ – [F]

# WP REWRITE LOOP START
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]

# REQUEST METHODS FILTERED
# If you want to allow HEAD Requests use BPS Custom Code and
# remove/delete HEAD| from the Request Method filter.
# Example: RewriteCond %{REQUEST_METHOD} ^(TRACE|DELETE|TRACK|DEBUG) [NC]
# The TRACE, DELETE, TRACK and DEBUG Request methods should never be removed.
RewriteCond %{REQUEST_METHOD} ^(HEAD|TRACE|DELETE|TRACK|DEBUG) [NC]
RewriteRule ^(.*)$ – [F]

# PLUGINS/THEMES AND VARIOUS EXPLOIT FILTER SKIP RULES
# To add plugin/theme skip/bypass rules use BPS Custom Code.
# The [S] flag is used to skip following rules. Skip rule [S=12] will skip 12 following RewriteRules.
# The skip rules MUST be in descending consecutive number order: 12, 11, 10, 9…
# If you delete a skip rule, change the other skip rule numbers accordingly.
# Examples: If RewriteRule [S=5] is deleted than change [S=6] to [S=5], [S=7] to [S=6], etc.
# If you add a new skip rule above skip rule 12 it will be skip rule 13: [S=13]

# Adminer MySQL management tool data populate
RewriteCond %{REQUEST_URI} ^/wp-content/plugins/adminer/ [NC]
RewriteRule . – [S=12]
# Comment Spam Pack MU Plugin – CAPTCHA images not displaying
RewriteCond %{REQUEST_URI} ^/wp-content/mu-plugins/custom-anti-spam/ [NC]
RewriteRule . – [S=11]
# Peters Custom Anti-Spam display CAPTCHA Image
RewriteCond %{REQUEST_URI} ^/wp-content/plugins/peters-custom-anti-spam-image/ [NC]
RewriteRule . – [S=10]
# Status Updater plugin fb connect
RewriteCond %{REQUEST_URI} ^/wp-content/plugins/fb-status-updater/ [NC]
RewriteRule . – [S=9]
# Stream Video Player – Adding FLV Videos Blocked
RewriteCond %{REQUEST_URI} ^/wp-content/plugins/stream-video-player/ [NC]
RewriteRule . – [S=8]
# XCloner 404 or 403 error when updating settings
RewriteCond %{REQUEST_URI} ^/wp-content/plugins/xcloner-backup-and-restore/ [NC]
RewriteRule . – [S=7]
# BuddyPress Logout Redirect
RewriteCond %{QUERY_STRING} action=logout&redirect_to=http%3A%2F%2F(.*) [NC]
RewriteRule . – [S=6]
# redirect_to=
RewriteCond %{QUERY_STRING} redirect_to=(.*) [NC]
RewriteRule . – [S=5]
# Login Plugins Password Reset And Redirect 1
RewriteCond %{QUERY_STRING} action=resetpass&key=(.*) [NC]
RewriteRule . – [S=4]
# Login Plugins Password Reset And Redirect 2
RewriteCond %{QUERY_STRING} action=rp&key=(.*) [NC]
RewriteRule . – [S=3]

# TIMTHUMB FORBID RFI and MISC FILE SKIP/BYPASS RULE
# Use BPS Custom Code to modify/edit/change this code and to save it permanently.
# Remote File Inclusion (RFI) security rules
# Note: Only whitelist your additional domains or files if needed – do not whitelist hacker domains or files
RewriteCond %{QUERY_STRING} ^.*(http|https|ftp)(%3A|:)(%2F|/)(%2F|/)(w){0,3}.?(blogger|picasa|blogspot|tsunami|petapolitik|photobucket|imgur|imageshack|wordpress\.com|img\.youtube|tinypic\.com|upload\.wikimedia|kkc|start-thegame).*$ [NC,OR]
RewriteCond %{THE_REQUEST} ^.*(http|https|ftp)(%3A|:)(%2F|/)(%2F|/)(w){0,3}.?(blogger|picasa|blogspot|tsunami|petapolitik|photobucket|imgur|imageshack|wordpress\.com|img\.youtube|tinypic\.com|upload\.wikimedia|kkc|start-thegame).*$ [NC]
RewriteRule .* index.php [F]
#
# Example: Whitelist additional misc files: (example\.php|another-file\.php|phpthumb\.php|thumb\.php|thumbs\.php)
RewriteCond %{REQUEST_URI} (timthumb\.php|phpthumb\.php|thumb\.php|thumbs\.php) [NC]
# Example: Whitelist additional website domains: RewriteCond %{HTTP_REFERER} ^.*(YourWebsite.com|AnotherWebsite.com).*
RewriteCond %{HTTP_REFERER} ^.*retailmakeover.ca.*
RewriteRule . – [S=1]

# CUSTOM CODE BPSQSE BPS QUERY STRING EXPLOITS
# BEGIN BPSQSE BPS QUERY STRING EXPLOITS
# The libwww-perl User Agent is forbidden – Many bad bots use libwww-perl modules, but some good bots use it too.
# Good sites such as W3C use it for their W3C-LinkChecker.
# Use BPS Custom Code to add or remove user agents temporarily or permanently from the
# User Agent filters directly below or to modify/edit/change any of the other security code rules below.

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
# WP REWRITE LOOP END

# DENY BROWSER ACCESS TO THESE FILES
# Use BPS Custom Code to modify/edit/change this code and to save it permanently.
# wp-config.php, bb-config.php, php.ini, php5.ini, readme.html
# Replace 88.77.66.55 with your current IP address and remove the
# pound sign # in front of the Allow from line of code below to be able to access
# any of these files directly from your Browser.

<FilesMatch “^(wp-config\.php|php\.ini|php5\.ini|readme\.html|bb-config\.php)”>
Order Allow,Deny
Deny from all
#Allow from 88.77.66.55
</FilesMatch>

# CUSTOM CODE BOTTOM HOTLINKING/FORBID COMMENT SPAMMERS/BLOCK BOTS/BLOCK IP/REDIRECT CODE
# WP AUTHOR ENUMERATION BOT PROBE PROTECTION
# Rewrites to author=999999 that does not actually exist
# which results in a standard 404 error. To the hacker bot
# it appears that this author does not exist without giving
# any clues that the author does actually exist.

RewriteCond %{QUERY_STRING} ^author=([0-9]){1,}$ [NC]
RewriteRule ^(.*)$ $1?author=999999 [L]