PayGol is an online payment service provider offering a wide variety of both worldwide and local payment methods.
Test your service by enabling test mode on your service (the Enabled/Testing button at "My Services", at the PayGol panel). Be sure to change it back to "Enabled" once you are done testing.
Some payment methods provided by PayGol (such as credit card payments) will confirm the payment immediately, so the payer will see the payment status as "Completed". However, other payment methods (such as local cash payment services) may take longer to confirm the payment. In these cases the payer will see the status "Processing". After the payment is confirmed by the local payments provider, the status will internally be updated to "Completed". Depending on your specific needs, you may want to use the "Hold Stock" WooCommerce setting if you need to make sure that stock is available for payments that are not notified immediately.