I've not used that package but:
The recipient is the person Receiving the payment, in this case it would be you, which would be handled by the following:
.... private $_ClientId='AVJx0RArQzkCCsWC0evZi1SsoO4gxjDkkULQBdmPNBZT4fc14AROUq-etMEY'; .... private $_ClientSecret='EH5F0BAxqonVnP8M4a0c6ezUHq-UT-CWfGciPNQOdUlTpWPkNyuS6eDN-tpA';
That looks like the credentials for where money will be received.
Are you trying to make it so that you PAY someone from your website?
EDIT: Try this package? https://github.com/angelleye/paypal-php-library it looks like it supports payments via email.
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