PAY ANY AMOUNT

Collect deposits and payments without fixed price products

Quantum includes a pay any amount flow so customers can enter their own payment value online. It is ideal for deposits, invoice payments, balances, and custom orders. This saves time and avoids creating extra products just to take payments.

Read the setup guide Buy Quantum

Works for direct to customer shoppers and for wholesale customers, depending on how you choose to use it.

What it is used for

A flexible payment tool for real business workflows.

Deposits Invoice payments Balance payments Pre orders Custom quotes Wholesale top ups

Deposits for custom work

Send a customer to a payment page, ask them to enter the agreed deposit amount, and checkout. No manual invoices required.

Pay an invoice online

Customers can pay an outstanding invoice amount without you creating a special product for that exact price.

Balances and final payments

Perfect for the second payment after a deposit, or any final balance that changes from customer to customer.

How it works

Simple for customers, simple for your team.

1

Create a payment product

Create a product such as “Make a payment” with one variant priced at $1. Keep it unlisted, publish it to Online Store, and turn inventory tracking off.
2

Connect the variant ID

Open the variant and copy the number after /variants/ in the Shopify admin URL. Paste that number into the Payment variant ID field in the section settings.
3

Share the page with the customer

Send the page link by email or text. Tell them the amount to enter, or let them choose their own amount.
4

Customer pays through checkout

The payment is processed through Shopify checkout, so it appears inside your normal order flow rather than outside your store.

The big win

Instead of creating lots of fixed price products just to collect different payment amounts, Quantum lets customers enter the right amount at the time of payment while still routing the order through Shopify.

Why this is better than fixed price payment products

Fixed price products force you into awkward workarounds when every customer needs a different amount.

The old way

Create multiple products at different prices
Edit products every time a quote changes
Send manual invoices and chase payments
Extra admin work for your staff

The Quantum way

One payment page that fits many use cases
Customers enter the amount you request
Payments recorded in Shopify orders
Fewer steps and fewer mistakes

Setup overview

The payment page uses a Shopify product variant behind the scenes, so setup only needs to be done once.

Payment product setup

Create a product such as Make a payment
Set the product status to Unlisted
Publish it to Online Store
Do not add it to menus or collections
Create one variant priced at $1
Turn inventory tracking off

Why the variant is needed

Shopify checkout needs a product variant to process payment
The payment page uses that variant as the payment carrier
If the variant is priced at $1, a $250 payment becomes quantity 250 at checkout
This lets customers pay custom amounts without you creating special products each time

Tax options

The payment variant controls whether tax is charged at checkout.

Use a taxable payment variant

Leave Charge tax switched on
Best for products, services, deposits, training, and wholesale payments
Tax will be calculated according to your Shopify tax settings

Use a non taxable payment variant

Switch Charge tax off on that payment variant
Useful for invoice balances, reimbursements, or payments where tax should not be added
You can create a separate payment product and use its variant ID instead

You can create more than one payment product if needed. For example, one payment variant can have tax on, and another can have tax off. The Make a Payment section will use whichever variant ID you paste into the Payment variant ID field.

FAQs

Clear answers for common setup questions.

What is the Payment variant ID

It is the ID of the payment product variant used by the section. Open the variant in Shopify admin and copy the number after /variants/ in the URL. Paste that number into the Payment variant ID setting in the theme editor.

Do I use the product ID or the variant ID

Use the variant ID, not the product ID. The correct number is the one that appears after /variants/ in the URL when you open the variant itself.

Should the payment product be unlisted or active

Keep the product unlisted and published to Online Store. This allows Shopify checkout to use it without making it a normal storefront product customers can browse.

Can I charge tax or not charge tax

Yes. The payment variant controls this. If Charge tax is on, checkout can add tax based on your store settings. If you do not want tax added, use a payment variant with Charge tax turned off.

Can customers pay invoice balances with this

Yes. You can send a payment link and tell the customer the amount to enter. It is ideal for balances and invoice payments.

Does this replace my product catalogue

No. This is for payments that do not fit standard product pricing, such as deposits and invoices. Your normal products still work as usual.

Is it safe for customers

Customers pay through your Shopify checkout using your normal payment providers. You control the wording and guidance on the payment page.