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Define the Advanced Custom Fields Pro license key with a constant
function my_filter_acf_pro_license_option( $pre ) {
if ( ! defined( 'ACF_PRO_LICENSE' ) || empty( ACF_PRO_LICENSE ) ) {
return $pre;
$data = array(
'url' => home_url(),
return base64_encode( serialize( $data ) );
add_filter( 'pre_option_acf_pro_license', 'my_filter_acf_pro_license_option' );
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