Code Duplication    Length = 5-7 lines in 2 locations

includes/wpinv-template-functions.php 2 locations

@@ 2112-2116 (lines=5) @@
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    $error = __( 'This invoice is only viewable by clicking on the invoice link that sent to you via email.', 'invoicing' );
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    if ( !empty( $invoice->ID ) && $invoice->has_status( array_keys( wpinv_get_invoice_statuses() ) ) ) {
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        if ( is_user_logged_in() ) {
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            if ( wpinv_require_login_to_checkout() ) {
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                if ( isset( $_GET['invoice_key'] ) && $_GET['invoice_key'] === $invoice->get_key() ) {
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                    $error = __( 'You are not allowed to view this invoice.', 'invoicing' );
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                }
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            }
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        } else {
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            if ( wpinv_require_login_to_checkout() ) {
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                if ( isset( $_GET['invoice_key'] ) && $_GET['invoice_key'] === $invoice->get_key() ) {
@@ 2117-2123 (lines=7) @@
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                    $error = __( 'You are not allowed to view this invoice.', 'invoicing' );
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                }
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            }
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        } else {
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            if ( wpinv_require_login_to_checkout() ) {
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                if ( isset( $_GET['invoice_key'] ) && $_GET['invoice_key'] === $invoice->get_key() ) {
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                    $error = __( 'You must be logged in to view this invoice.', 'invoicing' );
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                }
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            }
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        }
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    } else {
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        $error = __( 'This invoice is deleted or does not exist.', 'invoicing' );
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    }