reCaptcha not displaying

See Really Simple CAPTCHA

I did it. it worked for the first time, but when I refreshed the page, the reCAPTHCA has gone.

How can I fix it?

Same issue here.

Console says ‘ReCAPTCHA couldn’t find user-provided function: recaptchaCallback’

I did some digging and find out that the script with recaptchaCallback variable is not printing.

Below condition is returning true and thus not printing the javascript ahead. If I comment this, recaptcha appears again.

if ( ! wp_script_is( 'google-recaptcha', 'enqueued' ) ) {
	return;
}

p.s. recaptcha was working fine earlier. I am using wordpress 4.9.2 and latest contact form 7.

For now, I am removing the plugin’s action and adding mine. This works for me.

remove_action( 'wp_footer', 'wpcf7_recaptcha_callback_script');
add_action( 'wp_footer', 'as_recaptcha_callback_script');
function as_recaptcha_callback_script() {
	if ( ! wp_script_is( 'google-recaptcha', 'enqueued' ) ) {
		return;
	}
?>
<script type="text/javascript">
var recaptchaWidgets = [];
var recaptchaCallback = function() {
	var forms = document.getElementsByTagName( 'form' );
	var pattern = /(^|\s)g-recaptcha(\s|$)/;

	for ( var i = 0; i < forms.length; i++ ) {
		var divs = forms[ i ].getElementsByTagName( 'div' );

		for ( var j = 0; j < divs.length; j++ ) {
			var sitekey = divs[ j ].getAttribute( 'data-sitekey' );

			if ( divs[ j ].className && divs[ j ].className.match( pattern ) && sitekey ) {
				var params = {
					'sitekey': sitekey,
					'type': divs[ j ].getAttribute( 'data-type' ),
					'size': divs[ j ].getAttribute( 'data-size' ),
					'theme': divs[ j ].getAttribute( 'data-theme' ),
					'badge': divs[ j ].getAttribute( 'data-badge' ),
					'tabindex': divs[ j ].getAttribute( 'data-tabindex' )
				};

				var callback = divs[ j ].getAttribute( 'data-callback' );

				if ( callback && 'function' == typeof window[ callback ] ) {
					params[ 'callback' ] = window[ callback ];
				}

				var expired_callback = divs[ j ].getAttribute( 'data-expired-callback' );

				if ( expired_callback && 'function' == typeof window[ expired_callback ] ) {
					params[ 'expired-callback' ] = window[ expired_callback ];
				}

				var widget_id = grecaptcha.render( divs[ j ], params );
				recaptchaWidgets.push( widget_id );
				break;
			}
		}
	}
};

document.addEventListener( 'wpcf7submit', function( event ) {
	switch ( event.detail.status ) {
		case 'spam':
		case 'mail_sent':
		case 'mail_failed':
			for ( var i = 0; i < recaptchaWidgets.length; i++ ) {
				grecaptcha.reset( recaptchaWidgets[ i ] );
			}
	}
}, false );
</script>
<?php
}

Where did you put that code?

function.php of theme. If you do not have a child theme, please create one and put this code there.