woocommerce_should_load_paypal_standard filter not working | WordPress.org

I would like to restore the old PayPal standard payment method. However, the usual suspects don’t work:

add_action( 'plugins_loaded',function(){
  add_filter( 'woocommerce_should_load_paypal_standard','__return_true',9999 );
} );

add_filter( 'woocommerce_should_load_paypal_standard','__return_true',9999 );

This plugin by Jose doesn’t work either.

Any ideas?