Vouchers (shipping labels/tickets) are made easy with Speedex Courier for WooCommerce plugin . It helps you creating,  canceling  and tracking your WooCommerce orders, making your life and your customers lives easier.
<h2>Main Functions</h2>
<ol>
<li>Create vouchers</li>
<li>Print vouchers (single or in bulk)</li>
<li>Cancel vouchers</li>
<li>Track vouchers</li>
<li>Send automatic emails to customers with order tracking numbers</li>
<li>Automatically update an order status with “delivery completed” or “delivery denied”</li>
<li>Support Multiple Instances (You can use multiple credentials)</li>
</ol>
<h2>Screenshots</h2>
<img class="alignnone wp-image-4914728 size-large" src="https://woocommerce.com/wp-content/uploads/2019/10/speedex-sample-voucher.png?w=980" alt="speedex woocommerce voucher" width="980" height="704" />
<a href="https://woocommerce.com/wp-content/uploads/2019/10/speedex-woocommerce-screenshot-3.png"><img class="alignnone wp-image-4911639 size-large" src="https://woocommerce.com/wp-content/uploads/2019/10/speedex-woocommerce-screenshot-3.png?w=980" alt="speedex voucher WooCommerce preview " width="980" height="418" /></a> <img class="alignnone wp-image-4911640 size-large" src="https://woocommerce.com/wp-content/uploads/2019/10/speedex-woocommerce-screenshot-1.png?w=980" alt="Speedex WooCommerce settings preview" width="980" height="428" /> <img class="alignnone wp-image-4911641 size-full" src="https://woocommerce.com/wp-content/uploads/2019/10/speedex-woocommerce-screenshot-2.png" alt="Speedex WooCommerce Voucher Preview image 2" width="2034" height="772" />

Speedex Courier Voucher

With Speedex Courier Voucher for WooCommerce you can create, print, cancel vouchers(Shipping Tickets) from Speedex Courier in Greece.

<ul class="wccom-tick-list-primary">
<li>Access to all USPS, UPS, and other carriers’ shipping services 24/7</li>
<li>Discounted USPS rates – Save more money with shipping discounts on domestic and international</li>
<li>USPS Priority Mail® and Priority Mail Express™ shipments.</li>
<li>Discounted Stamps.com Insurance – Save 10% compared to USPS rates on package insurance.</li>
<li>Award-winning Technical Support Team with two gold medals to prove it</li>
</ul>
<hr class="wccom-product-heading__hr" />
<h2 style="text-align: left">Create shipping labels for USPS the smart way </h2>
With the <a href="http://stamps.com/woocommerce">Stamps.com</a> integration, you can automatically create ready-to-print shipping labels for USPS®, UPS®, and more carriers based on items in an order. Stamps.com seamlessly accesses the latest USPS rates when creating your labels, giving you unprecedented reliability, ease, and speed.
This extension does not display shipping rates to your customers during the checkout process. If you want USPS rates shown on the cart/checkout pages of your site, you need to purchase the <a href="https://woocommerce.com/products/usps-shipping-method/">USPS Shipping Methods</a> extension as well. Using these two extensions together, your customers see the best rates during checkout and you take advantage of those same rates when creating shipping labels via the backend order admin. 
<figure id="attachment_540160" aria-describedby="caption-attachment-540160" style="width: 378px" class="wp-caption aligncenter"><a href="https://woocommerce.com/wp-content/uploads/2014/10/stamps-com-toolbar.png"><img class="size-full wp-image-540160" src="https://woocommerce.com/wp-content/uploads/2014/10/stamps-com-toolbar.png" alt="Monitor your Stamps.com account from within the WooCommerce admin." width="378" height="250" /></a><figcaption id="caption-attachment-540160" class="wp-caption-text">Monitor your Stamps.com account from within the WooCommerce admin.</figcaption></figure>
You can also process refunds for and delete Stamps.com shipping labels, and top-up your Stamps.com account.
<figure id="attachment_540161" aria-describedby="caption-attachment-540161" style="width: 291px" class="wp-caption aligncenter"><a href="https://woocommerce.com/wp-content/uploads/2014/10/stamps-com-metabox-2.png"><img class="size-full wp-image-540161" src="https://woocommerce.com/wp-content/uploads/2014/10/stamps-com-metabox-2.png" alt="Stamps.com address verification in the admin meta box." width="291" height="330" /></a><figcaption id="caption-attachment-540161" class="wp-caption-text">Stamps.com address verification in the admin meta box.</figcaption></figure>
<figure id="attachment_540162" aria-describedby="caption-attachment-540162" style="width: 291px" class="wp-caption aligncenter"><a href="https://woocommerce.com/wp-content/uploads/2014/10/stamps-com-metabox-labels.png"><img class="size-full wp-image-540162" src="https://woocommerce.com/wp-content/uploads/2014/10/stamps-com-metabox-labels.png" alt="Stamps.com labels for the current order, when viewing an order within the WooCommerce admin." width="291" height="216" /></a><figcaption id="caption-attachment-540162" class="wp-caption-text">Stamps.com labels for the current order when viewing an order within the WooCommerce admin.</figcaption></figure>
With nearly 500,000 customers, Stamps.com has become the leading USPS postage provider in the country by simplifying access to the lowest USPS shipping rates and the most popular USPS services. Whether you ship one package a day or 1000, from your garage or a giant warehouse, Stamps.com has the tools to make your USPS® shipping process faster, more affordable and more efficient.
Plus WooCommerce customers get exclusive USPS shipping discounts with no minimum volume requirements to help reduce shipping costs. Your average Priority Mail rates are 3% less than standard Commercial Base Pricing and 17.3% less for Priority Mail Express.
<a href="http://www.stamps.com/woocommerce">Sign up</a> for your Woocommerce-Stamps.com account today and save!
<h2>I don’t have a Stamps.com yet. What do I need to do?</h2>
Sign up for a new <a href="http://www.stamps.com/woocommerce">Stamps.com </a>account today! Every Stamps.com account includes:
<ul>
<li>Special $100 value offer: $50 off a digital scale and $50 off a label printer</li>
<li>Unlimited shipments</li>
<li>Unlimited sales channels</li>
<li>Unlimited tech support</li>
</ul>
<h3>What type of USPS shipping rates will I get?</h3>
At WooCommerce, we understand you’re looking for ways to save money. That’s why we’ve teamed up with IntuiShip, a volume postage partner of the USPS, to offer you deep shipping discounts to help reduce shipping costs. Savings are delivered directly through your WooCommerce-Stamps.com account. No additional account is needed.
Here are examples of discounted rates you get:
<a href="https://woocommerce.com/wp-content/uploads/2014/10/stamps-pricing-table.png"><img class=" wp-image-1873448 alignleft" src="https://woocommerce.com/wp-content/uploads/2014/10/stamps-pricing-table.png?w=620" alt="stamps-pricing-table" width="596" height="269" /></a>

WooCommerce Stamps.com API

With the Stamps.com integration you can automatically create ready-to-print shipping labels for USPS, based on items in an order.

Speedex Courier Voucher vs WooCommerce Stamps.com API