* Remove unused ResultPos.php

* Improve username password validation when accepting notifications

* [PW-2387]: IP validation implementation  (#713)

* [PW-2387]: IP address cache config, cronjob and notification check

* [PW-2387]: Removing unrelated files

* [PW-2387]: Removing unrelated files

* [PW-2387]: Newlines

* [PW-2387]: Replacing PHPUnit functions

* [PW-2387]: Formatting

* Update etc/adminhtml/system/adyen_security.xml
Co-authored-by: cyattilakiss <42297201+cyattilakiss@users.noreply.github.com>

* [PW-2387]: Adding log message when there's no IP addresses in cache

* [PW-2387]: Updating IP addresses in cache on notification-receving

* [PW-2387]: Adjusting unit tests for IpAddress class

* [PW-2387]: Adjusting unit tests for IpAddress class

* PHP API Library version
Co-authored-by: cyattilakiss <42297201+cyattilakiss@users.noreply.github.com>

* [PW-2385] - Use mandatory HMAC validation for notifications (#716)

* Initial commit

* Add the event codes list

* Remove debug statements

* Add hmac_key for test and live. Add in the sensitive section in di

* Fix recommended changes

* Create isDemoMode config method

* Minor code improvements

* Replace demo_mode with const

* Revert isDemoMode

* Update etc/adminhtml/system/adyen_security.xml
Co-authored-by: Ángel Campos <angel.campos@adyen.com>

* Remove unnecessary conditional

* Add IP check cronjob to README

* Update Helper/IpAddress.php
Co-authored-by: Alessio Zampatti <alessio.zampatti@adyen.com>

* Add comment to Security section

* Hmac->HMAC

* Require adyen/php-api-library version ^6.3
Co-authored-by: Ángel Campos <angel.campos@adyen.com>
Co-authored-by: Alexandros Moraitis <alexandros.moraitis@adyen.com>
Co-authored-by: Marcos Garcia <marcos.asgarcia@gmail.com>
Co-authored-by: Alessio Zampatti <alessio.zampatti@adyen.com>