Undefined constant error… Can't log into site!

  • Hi,

    I can’t seem to log into my site admin to rectify an issue. I believe the source of the problem are a couple plugins I installed related to PayPal.

    When I go to my main site however(Not logged in)It shows the error
    ‘Use of undefined constant OP_SN – assumed ‘OP_SN’ on the top of the page.

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