paul2009

On Squarespace, the checkout currency must be set to one of the supported currencies. You cannot change the checkout currency using code. It simply is not possible. 

Hi. This happens because, when you are clicking the link, you are already logged in with your 'Site 1' login details. As you are already logged in with your 'Site 2' ID, it won't let you use another.
The trick is to right-click the contributor invitation link that arrives by email and choose to open it in a Private or Incognito window. You should then be able to accept the invitation.
These permissions aren't affecting the issue with invitations, but the template author should not remain as the owner of the site. Shortly after purchase, I would expect the template author to transfer ownership of the site to you. If this hasn't happened within a reasonable period of time then I recommend that you contact them and ask them to do so. Only the current site owner can transfer ownership of the site. 
After they transfer ownership to you, the former owner may remain as a contributor with administrator permissions, unless they manually remove themselves. If you don't want them to have permissions on your site, you can remove the previous owner.
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November 2020: There isn't a specific feature for this, but one option is to add 'Gift Wrap' as a variant for the product, so that users must choose "No Gift Wrap" or "Gift Wrap" before they click Add to Cart. You can set the price of different variants, allowing you to set the gift wrapped price to $5 higher.
November 2023: A new Product Add-on feature has been introduced, allowing you to add a gift wrap option without affecting the stock level of the main product. 

If it helps, I reviewed a number of third party 'flip book' solutions to see which one was the most cost effective solution for embedding flipbooks in Squarespace. Heyzine was the winner by far. 
FlippingBook was too expensive. Plans start at £25 ($31 USD) per month for just 3 flipbooks! To host 10 flip books you need to pay £37 ($47) per month!
Flipsnack looked very promising with plans starting at $14 USD (around £11) per month but this plan was limited to 10 flipbooks. Also, the colour of the background (behind the animated book) is a dark grey colour and could not be changed to match the background of the website. 
Issuu is £32 ($40) per month before you can remove external advertising from your flipbook!
PDF Flip required me to download and host a number of files that weren't Squarespace friendly, ruling this out for me. 
Heyzine is my preferred solution. It is just £3 per month ($4 USD) and includes:
Unlimited flip books Unlimited pages No ads No watermarks White label branding (no Heyzine logo!) Choose a background image or a plain colour behind the flipbook. You can also use your own company brand colors. You can add upload your PDF to Heyzine, choose how you want it to look and then download the embed code, which can be pasted into a Markdown block. I wrote a guide that explains how to do add a flipbook to Squarespace using it.
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Can you provide some more details, including a link to the site and a link to the size chart? For example, has it been saved as an HTML table, an image or another page?

You can add "bundle" variants for Small, Medium and Large with different price points, is that what you mean? See Adding product variants for more details. After adding the variant names, you can click EDIT ALL to change the prices of individual variant options.

In my opinion, this is a huge issue for anyone using Squarespace 7.1.
Whenever an image block is added to a Classic (not Fluid Engine) section, a Blog Post, an Event or the Product Additional Info section, Squarespace add the demo text "Make it stand out" and "Whatever it is, the way you tell your story online can make all the difference." and there's nothing you can do about it! As mentioned above, this has been happening since early 2021. I've written about it in this post.
I asked about this issue again in 2023 and was told:
"While we understand it may be inconvenient, I do need to confirm that Engineering doesn’t currently have plans to fix or improve the sitemap issue you reported [in June 2021]."
There's a further SEO issue when you use pre-built page layouts. With these, a default SEO title is assigned (silently). Instead of defaulting to the page title, it sets the SEO title to the page layout name - such as "General 1", "Appointments 1", "General 2", "Blog 2" and so on.
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You can change these with some CSS that you'll add to Design > Custom CSS.
Addressing the alignment issue first, you can fix this by adding some margin along the bottom of the sign-in link.
.Header-account.loaded .user-accounts-text-link {     margin-bottom: .309em; } Once the link is aligned, you can add some background color and some padding to make the link look like a button. You didn't say how you wanted it to look, so I've assumed that you want to match the buttons on the banner image. These have rounded edges, so you'll also need to set a border radius. If you add these to the CSS above, it should look something like this:
.Header-account.loaded .user-accounts-text-link {     margin-bottom: .309em;     background-color: #dec29c;     border-color: #dec29c;     padding: 17px 21px;     border-radius: 300px; } The link should now look like a button, but it doesn't change when you hover over it. To include this effect (and to match your other buttons) add the following CSS too:
.user-accounts-text-link:hover {      opacity: .8; }  Note that due to a bug on Squarespace (Feb 2021) you may need to save and close the CSS panel before you'll be able to hover over the button to see this effect. Hopefully this bug will be fixed soon!

The CSS above should take care of the link in the desktop nav. If you'd like to do the same with the link on mobile devices, you'll need to add some more CSS, but this time referring to the Mobile-bar. I've included some settings to make the link uppercase and reduce the font size slightly.
.Mobile-bar-account.loaded .user-accounts-text-link {     background-color: #dec29c;     border-color: #dec29c;     padding: 17px 21px;     border-radius: 300px;     text-transform: uppercase;     font-size: 11px; }
I hope this helps.
Notes: 
The instructions above are for a Squarespace 7.0 site using a Brine-family template. Other versions and templates will require different code.
-Paul
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You can use the standard keyboard shortcut to add a non-breaking space within a Text Block.
On a Mac this is Option+Spacebar. On a Windows computer, I believe it's usually Ctrl+Shift+Spacebar.

Have you tried setting the stock level to zero and enabling the Product Waitlist feature?
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@cathpamp @EmberMorrow As a starting point, please see the guide Verifying third-party domains for Email Campaigns. This guide explains how to verify your domain by updating or adding DNS records.

This is not possible on Squarespace. You only have frontend access. 

Thanks for the domain name details. I checked and the site details have fully propagated and I can access the site (I see the prompt for the site password). Looks like a local issue on your work network. Give them the details you posted here 🙂

I have not, but I will. I wanted to make sure others saw it as well.

Wow, I'm continually impressed with this Forum and the people who keep it running. 
Yes, I found a web wrapper which was relatively simple and did a decent job (https://www.webtonative.com/)
I may need to do something like this again in the future. I'll check out Progressier.
Thank you always!

Have you looked at the Squarespace extension called Progressier? It is supposed to turn a Squarespace site into a Progressive Web App (PWA) — making it installable on mobile devices.

An alternative to your current method would be to use SS's built-in add to cart buttons on the PLP (product list page).

You'll have to decide if the UI SS provides is to your liking.
Let us know how it goes.

Have you added product variants to the products?
Variants will appear on the Product Detail Page (PDP) as either a dropdown list or as buttons. To learn more, visit Styling store pages.
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This Email Signup option is new (July 2023) and, as you mentioned, the caption for this checkbox is currently fixed. I made a feature request for this to be editable (Circle members can vote it up here), but right now you'll need some code (JavaScript or CSS) to change it. 
Try this CSS:
#collection-655db204d1c0f4729bc67032 .form-item.field.email.required .option label span {     margin-top: 4px;     font-size: 0;     visibility: hidden; } #collection-655db204d1c0f4729bc67032 .form-item.field.email.required .option label span:before { content: "Anklicken um Anmeldebestätigung erhalten.";     font-size: 14px;     visibility:visible; } It is a bit "hacky" but should work. I've included the Collection ID for that page so that it doesn't affect other forms on the site, so this will need to be removed or updated if you want to use it on other forms/pages:

Let me know if experience any issues.
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If you add a tag called "Size M", "Size XL" (and so on) to the products, the following code should add visible size labels like these:

To test it (as shown in the screenshot above) I needed to add those size tags to your products because the tags on your site don't include the prefix "Size ".
The script below can be added to the Code Injection FOOTER panel:
<!-- Add product size labels to product list pages on Squarespace 7.1 ----------------------> <!-- Copyright Soundfocus Digital [sf.digital] ---------------------------------------------> <!-- Use freely in your code injection. Do NOT re-publish.----------------------------------> <script> const gridItems = document.querySelectorAll('.grid-item'); gridItems.forEach((gridItem) => {   const gridMetaStatus = gridItem.querySelector('.grid-main-meta');   const classList = gridItem.classList;   const tagLabels = [];   classList.forEach((className) => {     if (className.startsWith('tag-size-')) {       const tagLabel = className.slice(9);       if (!tagLabels.includes(tagLabel)) {         tagLabels.push(tagLabel);       }     }   });   if (tagLabels.length > 0) {     const tagLabelsContainer = document.createElement('div');     tagLabelsContainer.classList.add('tag-labels');     tagLabels.forEach((tagLabel) => {       const label = document.createElement('div');       label.classList.add('tag-label');       label.textContent = tagLabel;       tagLabelsContainer.appendChild(label);     });     gridMetaStatus.appendChild(tagLabelsContainer);   } }); </script> <!-- End of product size labels ------------------------------------------------------------> This can be added to the Custom CSS panel and can be tweaked to change colour, size and so on:
/************************************** Size label styling on PLP **************************************/ .grid-item .grid-main-meta .tag-labels {   text-align: center;   margin-bottom: 7px;   } .grid-item .grid-main-meta .tag-label {   font-size: 10px;   color: #000;   margin-left: 6px;   margin-top: 11px;   padding: 4px 8px;   border: 1px solid #000;   text-align: center;   text-transform: uppercase;   display: inline-block;   line-height: 1.2em;   //font-weight: bold;   //background-color: #f0f0f0; } /* Don't show sizes when sold out */ .grid-item.sold-out .grid-main-meta .tag-label {   display: none; }  
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@kajumi10999 @byboldstudio Within Edit Form Fields (as shown in your screenshot) click the Email field and the scroll down to Email Signup and toggle it off. The 'Sign up for news and updates' option will be removed.

Note that when Email Signup is disabled, their contact details will not appear in the Contacts panel under Subscribers. 
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These are part of the Squarespace custom CMS platform and you cannot remove them.
Bear in mind that these tools are designed for developers who code their sites from scratch and have full control over their code and styles. When you use these tools to test Squarespace sites you'll see results that are not relevant to you.
Things worth considering when trying to increase site performance include:
Don't add custom code that you find on forums, without understanding how it works and how it will slow down your site. In particular, try to avoid adding any code that includes a '$' character as this denotes it relies on a comparatively large code library called jQuery that must be downloaded by your visitors, slowing down your site unnecessarily. Don't add third party trackers or pixels, like AddThis, GTM, LinkedIn and so on. These can really slow down your site's loading times. Use Squarespace 7.1 in preference to 7.0. Squarespace 7.1 can appear faster for visitors than Squarespace 7.0 and is constantly being improved. If you are planning to use Squarespace 7.0, use a Brine-family template. Brine-family based sites have a feature called Ajax Loading which improves performance over other 7.0 templates that don't have this feature. Keep image sizes low. Ideally, images should be less than 500KB in size, with a width of 1500px or 2500px. Keep galleries small. Ideally, limit them to 50 images each.  Keep Banner Slideshows small (less than 10 images), especially on 7.0 Index pages and 7.1 pages with multiple sections. Limit the number of Blocks on one page to 60. Use JPEG (.jpg) images where possible (but PNGs for logos). Limit the number of GIFs. Don't heavily compress JPEG images before adding them or their file size may increase after Squarespace processes them  Avoid embedding content where possible. Don't embed content or libraries unless they are essential. Reduce the number of fonts. Fonts must all load behind the scenes before the page can appear in the browser. -Paul
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Email notifications are sent from Squarespace email servers. This means you don't need to concern yourself with authentication methods.
On a related issue, if you are using a custom domain for these emails you may need to configure DKIM or SPF records. See Custom email addresses and Squarespace for more info.
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That did work! Thank you very much.

@paul2009 my client is experiencing the same issue disabling Express Checkout seems to work however it is adding one step and he sells only one product. Any timeline on the fix?