You download Wordpress/woo-commerce plugin from

Jazz-cash payment gateway sandbox portal
32e5e897-af97-458d-bb2f-3b407ae7863a-image.png
1cd31836-d3da-45d7-955f-430089d19b2a-image.png Wordpress plugin page search for the jazz-cash plugin.
Click on install button and plugin will be install after installation process is complete Click on activate button to activate the Jazz-cash plugin, and provide the credentials like merchantID, password, integrity salt and return URL. and click on save button and enjoy.

@moaaz said in Online Payment Gateway for Pakistan:

JazzCash is enabled and WooCommerce is not forcing the SSL certificate on your checkout page. Please ensure that you have a valid SSL certificate and that you are forcing the checkout pages to be secured.

4 Steps to resolve issue SSL certificate on your checkout page:

Disable Really Simple SSL plugin. Go to Woocommerce settings – Advanced tab. On “Secure Checkout” option, check “Force Secure Checkout” Then, and only then, enable Really Simple SSL plugin.
At this point you should have no error.