Hello,
Thanks for your elements, on the first plugin method you have the option to directly enter your required return Url (order confirmation page), then you have just to fill this field.
For the second payment method, no option like previously, then there are good chance that you can directly on the payment server define this (via your merchant account settings I guess), if not can you precise which payment method is shown in your second set of screenshot, please ?
Hope this will help to progress.
Regards