Free tools
Free tools for online stores and the developers who build them.
Price a headless Shopify store, write your return policy, check Apple Pay domain verification, and find the right test card, free and with no sign-up. Each tool also shows how the same job works on Flint Pay, a payments API for US businesses with orders, checkout, returns, and subscriptions built in.
3.79% + 35¢ on cards · no monthly fee · free sandbox · no credit card
- For founders, agencies, and developers
Shopify headless cost calculator
Price a headless Shopify store by the month: the plan, card fees, the third-party fee, and the apps it needs, line by line.
The same store on Flint sits beside it, with no plan or apps to add.
Price your storewithflintpay.com - For store owners
Return policy generator
Choose your return window, fees, exchanges, and store credit, and copy the policy as HTML, text, or Markdown.
Flint can enforce the same policy on every return.
Write your policywithflintpay.com - For developers adding Apple Pay
Apple Pay domain checker
Check why Apple Pay domain verification fails: redirects, TLS errors, CDN blocks, and wrong files, with the fix for each.
On Flint, you never host an association file.
Check your domaindevelopers.withflintpay.com - For developers testing payments
Test card lookup
Paste any test card number to see what it does on Flint, Stripe, Adyen, Braintree, PayPal, Square, Checkout.com, and Authorize.net, with expiry, CVC, and decline triggers.
Pay orders with test cards in a free Flint sandbox.
Find a test carddevelopers.withflintpay.com
Start
Try the commerce system on a free sandbox.
No credit card and no sales call. Create an order, take a test payment, and refund one line with its share of the tax.