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REST API changes in WordPress 5.5 are documented here:

REST API changes in WordPress 5.5

My change in the shariff.php file after line 210 to add that line:

'permission_callback' => '__return_true',

The function (shariff.php, line 187-215) after the my change:

/** Register the wp rest api route and sanitize the input */
function shariff3uu_sanitize_api() {
	register_rest_route(
		'shariff/v1',
		'/share_counts',
		array(
			'methods'  => 'GET',
			'callback' => 'shariff3uu_share_counts',
			'args'     => array(
				'url'       => array(
					'sanitize_callback' => 'esc_url',
					'required'          => true,
					'description'       => __( 'URL of the post or page to request share counts for.', 'shariff' ),
				),
				'services'  => array(
					'sanitize_callback' => 'sanitize_text_field',
					'required'          => true,
					'description'       => __( 'A list of services separated by |. Example: twitter|facebook|xing', 'shariff' ),
				),
				'timestamp' => array(
					'sanitize_callback' => 'absint',
					'description'       => __( 'Timestamp of the last update of the post. Used for dynamic cache lifespan.', 'shariff' ),
				),
			),
			'permission_callback' => '__return_true',
		)
	);
}
add_action( 'rest_api_init', 'shariff3uu_sanitize_api' );

@kometschuh
Thank you for debugging this and providing the code. I am disappointed to see the dev has not even acknowledged your help, much less fix the problem. I am not a coder and will have to wait til the plugin is fixed.

Hi @starguide,

Thanks very much for your post and the plan for the update.