Looking for help with HikaSerial for Gift Certificates

-- HikaShop version -- : 4.2.2
-- HikaSerial version -- : 3.0.1
-- Joomla version -- : 3.9.14
-- PHP version -- : 7.2.26
-- Browser(s) name and version -- : Firefox 71.0

I am looking for someone who can walk me through, step by step, how to set up a gift certificate. I have read the documentation and tried to copy the demo, but I think I don't totally grasp the whole serial concept. Please don't just refer me to the documentation or demo. I am looking for a mentor.
Any one willing?

Hi Jerome,
I am sorry I took so long to get back to you but I would like to try to figure out how to create a gift certificate. The concept is that someone would buy and pay for a gift certificate and then give it to someone who would then use it to purchase any of those products. The gift certificates might come in a couple different amounts — say $20 and $40.
I have purchased Hikaserial and used the demo as a guide to:
1- Create an HikaShop coupon with a flat amount-$20 (this is the only time I changed a setting from what the demo had, which was 0 EUR)
2 - Note the id of the coupon and unpublished it.
3 - Create a "Coupon Generator" entry.
4 - Enter the coupon id which would be use as template.

I opened up one of my products that I would like this to be able to be applied towards and added it to the serial section.
I am not at a loss as to how to test this? whether I need to create another coupon for $40? id there a way to create a gift certificate that you can fill in an amount? How to sell the gift certificate?
As you can see, I don't know what to do next.
Please help if you can.'
Ellen

I created a pack, see image for settings.
My coupon is unpublished.
I would like to use the variable discount setting but I don't know what to put in there. The demo has 100, but I think the documentation is telling me I should leave it blank for a 'donation', is that correct? What about any other settings in the coupon generation plug in. I am attaching an image of those settings. Anything I should change?

Then what? How do I present the gift certificate option as a menu item or link on the front end?
How do I test if it works once It is purchased and applied to a product?
Can it be applied to a category of products or each product individually?

Thanks for all you patience and help,
Ellen

I changed the percentage value back to 100 in the coupon generator.
I created a menu item for the product Gift Cert.
I filled in the amount and proceeded to cart. The item is listed and the amount, but the amount is not listed under Total Price and it is not included in the totals.See attached.

even though I am using it for a 'fill in any amount' gift certificate?

Ok, I am getting closer:)
I have a menu item for the Gift Certificate (product).
I made a purchase with the value of $1.
the checkout process went as expected.
Since for testing purposes, I did not want to use a credit card or paypal, I used the payment option Collect on Delivery.
I changed the status manually to confirmed in the back end and requested an email be sent.
I received the email confirming the purchase, but it did not include a 'serial' number.
I did publish the plugin for Attach Serial as described here I filled it out according to the example at the end of the page.I also added the file to the product Gift Certificate like in the demo.
But it doesn't show up anywhere.
How do I 'attach' it to an email? What am I missing?

So I tried it again, this time confirming it in the details. I received one confirmation, and it did include a serial number.But not the gift card from the Attach Serial plugin.
I tried to make a new purchase using the coupon, it accepted the coupon but the value was $0.
What am I doing wrong?

I am attaching a screen shot of my settings. I think I have it right.
How do I set up a virtual product file?

Here is the screenshot of the Attach serial plugin

I published it and retested it. Still never received the certificate. Just the confirmation.