PatSaTECH

The Sage Pay Payment system provides a secure, simple means of authorizing credit and debit card transactions from your website.
The Sage Pay system provides a straightforward payment interface for the customer, and takes complete responsibility for the online transaction, including the collection and encrypted storage of credit and debit card details, eliminating the security implications of holding such sensitive information on your own servers.
So this plugin helps you to accept payments on your WooCommerce Store using SagePay Accounts. 
Send us your ideas and feedback here: https://www.patsatech.com/contact-us

SagePay Server Gateway for WooCommerce

The form option gives blank screen after payment eventhough it's successful to send payment and the server option not working at all.



Not working

SagePay Server Gateway for accepting payments on your WooCommerce Store.

This add-on connects Gravity Forms to Opayo Form (formerly Sage Pay Form), Elavon’s hosted payment integration. Shoppers are sent to Opayo to enter card details; card data never touches your WordPress site, which keeps your PCI scope lower than with on-page card fields.
You need
<ul>
<li>WordPress 4.5 or higher and a supported PHP version (7.0+ recommended).</li>
<li>Gravity Forms with a license that includes payment add-ons (this plugin extends the Gravity Forms payment framework).</li>
<li>An Opayo account with Form integration enabled, plus your vendor name and Form encryption password from MyOpayo.</li>
</ul>
What it supports
<ul>
<li>Product and donation feeds, billing field mapping, and delayed notifications or post creation until payment completes (where you configure it in the feed).</li>
<li>Opayo VPS Protocol 4.00, test and live modes, and current Elavon gateway hosts (<code>sandbox.opayo.eu.elavon.com</code> / <code>live.opayo.eu.elavon.com</code>), with a filter to override URLs if your integration pack specifies different endpoints.</li>
<li>Reliable handoff to Opayo using a short on-site URL plus a transient (avoids oversized query strings that can cause registration errors).</li>
<li>After payment, customers can be returned to the form’s page so Gravity Forms can run the normal confirmation (message or redirect), using the entry’s source URL when available.</li>
</ul>
Support and feedback
Questions or ideas: <a href="https://www.patsatech.com/contact-us" rel="nofollow ugc">contact PatSaTECH</a>.

Opayo Form Payment Gateway for Gravity Forms

Accept card payments in Gravity Forms using Opayo Form (hosted checkout by Elavon)—customers pay on Opayo’s pages, not on your server.

SagePay Server Gateway for WooCommerce vs Opayo Form Payment Gateway for Gravity Forms