Moacir

This plugin allows you to reduce shipping rate dynamically according to products in the customer cart.
Each product can donate a value to reduce shipping rate, so if there are two products in the cart, one with 2.00 of discount and another with 3.00 of discount, if the shipping rate is 17.00 this plugin will reduce shipping rate to 12.00.
The idea behind this plugin is to improve your sales by transferring the shipping rate to product price avoiding customer to abandon on the checkout/cart page.

WooCommerce Shipping Discount

Claudio Sanches

This plugin allows you to add discounts per payment methods. 
Just set a amount (fixed or %) to the payment methods you want to give discount and is ready! 
At the moment of payment the customer will be able to see each discount available for each payment method.
Note that this plugin works only with WooCommerce 3.0 or later.
<h4>Contribute</h4>
You can contribute to the source code in our <a href="https://github.com/claudiosanches/woocommerce-payment-discounts" rel="nofollow ugc">GitHub</a> page.

Discounts Per Payment Method on WooCommerce

Adds discounts for specific payment methods in WooCommerce.

WooCommerce Shipping Discount vs Discounts Per Payment Method on WooCommerce