WooCommerce plugin to make bought products lists [closed]

I need plugin (free or commercial) which let customer make featured lists and add ordered products to that lists. For example customer might create lists like "Trousers" "Shoes" "Tshirts" then when he will buy a new product (Shoes for example) in our store he might select list "Shoes" at checkout. In MyAccount section it would be nice that customers could check what he already bought separated per created categories.

Thanks

How to indicate to users that an email-only domain is active? [closed]

I use a domain name with no website attached to it for all of my personal emails, i.e. it only has MX/TXT records, and no A/CNAME ones. I’ve had a couple of instances in the past where people thought that I gave them a wrong email address because they tried typing my domain into their browser and, naturally, it didn’t resolve.

So I’m thinking of putting together a simple HTML page and pointing the domain to it for the sole purpose of indicating to those people that the domain is indeed active. However, I’m struggling with what that page should say and look like. What would you do if you were me? Thanks!

Configure ubuntu on digitalocean so that URL of main domain without www in front can work [closed]

I have a Ubuntu 20.04.3 LTS virtual machine running nginx/1.18.0 on DigitalOcean.

Currently, when I key in the URL https://www.main-domain.com, it works. However, when I key in the URL https://main-domain.com, I get the following error;

This site can’t be reached. main-domain.com’s server IP address could not be found.

I am not sure whether this is a DNS or nginx problem.

How can I configure the digitalocean Ubuntu VM such that the URL https://main-domain.com without the www in front works?

Woocommerce if use a specific gateway, then set the value [closed]

I want to add a filter or an action for the plugin, the purpose is to set the value to "0" if the order used "myCRED" gateway.

I found those 2 related filters of the plugin,

uap_filter_referral_amount uap_public_filter_on_referral_insert_amount_value 

actually, I am not sure which one should I use, but I tried both of the 2 filters, when checkout it shows internal error, I think the code may have some error, any one can help?

Here is the code I have tried:

function exclude_mycred_gateway( $  order ){     $  payment_title = $  order->get_payment_method_title();     if ( $  payment_title ) {         $  payment_title == "myCRED";         return "0";     } }  add_filter( 'uap_filter_referral_amount', 'exclude_mycred_gateway'); 

How to symbolically manipulate the closed form series output from the easyFourier package?

EasyFourier by @xzczd is a nice package to obtain a Fourier series in closed form, e.g.

f = x^2 easyFourierTrigSeries[f, {x, -\[Pi], \[Pi]}, \[Infinity]] 

enter image description here

However, the output cannot be manipulated symbolically, at least I don’t know how to. For instance, differentiating the Fourier series is not possible like this:

D[easyFourierTrigSeries[f, {x, -\[Pi], \[Pi]}, \[Infinity]],x] 

enter image description here

What I would like to do is something comparable to the following, where I have copied the summand manually into a regular Mathematica Sum:

enter image description here

BTW: How do I downscale the size of pictures in stack exchange? Is there no easier way to insert Mathematica output? How can I insert complicated Mathematica input code in 2d-mode? (Thanks for hints to these "meta" questions, too.)