First payment date for WooCommerce Subscriptions

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All output should be run through an escaping function (see the Security sections in the WordPress Developer Handbooks), found '$loop'.

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Processing form data without nonce verification.

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date() is affected by runtime timezone changes which can cause date/time to be incorrectly displayed. Use gmdate() instead.

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$_POST['_fpdws_date_first_payment'] not unslashed before sanitization. Use wp_unslash() or similar

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Detected usage of a possibly undefined superglobal array index: $_POST['_fpdws_date_first_payment'][$post_id]. Check that the array index exists before using it.

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A function call to __() with texts containing placeholders was found, but was not accompanied by a "translators:" comment on the line above to clarify the meaning of the placeholders.

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Function "wp_timezone_string()" requires WordPress 5.3.0, but your plugin minimum supported version is WordPress 3.4.0.

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Classes declared by a theme/plugin should start with the theme/plugin prefix. Found: "FirstPaymentDateForWooCommerceSubscriptions".

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All output should be run through an escaping function (like esc_html_e() or esc_attr_e()), found '_e'.

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PHP file should prevent direct access. Add a check like: if ( ! defined( 'ABSPATH' ) ) exit;