wordpress advanced custom fields google map api key

A solution could be editing the functions.php in your template

//TODO: fix api key for advanced custom field
add_action('acf/fields/google_map/api', function($api){
$api['key'] = '<YOUR_API_KEY>';
return $api;
});

or you can check my article for a complete solution

ACF updated the Google Map documentation

You first have to get a Maps API key and make sure you activate the following APIs :

• Maps JavaScript API
• Geocoding API
• Places API

Then register the API key in your functions.php

If using ACF free

function my_acf_google_map_api( $api ){
    $api['key'] = 'xxx';
    return $api;
}
add_filter('acf/fields/google_map/api', 'my_acf_google_map_api');

If using ACF pro

function my_acf_init() {
    acf_update_setting('google_api_key', 'xxx');
}

add_action('acf/init', 'my_acf_init');

In my case I had to delete & recreate the field so that it saves correctly.