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public function validate_api_key_field( $key, $value ) {
    if ( isset( $value ) && 20 < strlen( $value ) ) {
        WC_Admin_Settings::add_error( esc_html__( 'Looks like you made a mistake with the API Key field. Make sure it isn&apos;t longer than 20 characters', 'woocommerce-integration-demo' ) );
    }

    return $value;
}