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Build with Square

Build applications that use Square

Evonx does not claim an official Square partnership. Build commerce and POS-adjacent applications that charge cards, sync catalogs, and reconcile payments through Square APIs under your seller accounts.

Build an app with EvonxAll integrations

What Square is

Square provides payments, POS, catalog, and commerce APIs for sellers accepting in-person and online payments.

Evonx helps you build applications that use Square APIs — this page does not claim an official partnership unless one is explicitly stated.

What you can build

  • Online checkout with Square payments
  • Catalog sync for retail apps
  • Order and payment webhooks into your OMS
  • In-person payment flows with Square Terminal

Application types

Retail

Restaurants

Service businesses

Technical considerations

  • Verify webhook signatures for payment events
  • Use Square sandbox locations before production
  • Map location IDs carefully for multi-store sellers

Related resources

How to integrate Square paymentsFollow these steps in Evonx to add Square payments for online or in-person checkout. Use this when POS or invoicing flowCRM templateTrack leads, accounts, and pipeline stages with activities your team can evolve in production. This template maps a B2B SaaS templateLaunch a multi-tenant product skeleton with auth, settings, and billing integration points.Admin dashboard templateCentralize configuration, user management, and monitoring for internal operators.Customer portal templateLet customers view orders, tickets, documents, and profile data without emailing your team.Inventory management templateTrack SKUs, warehouses, adjustments, and low-stock signals for fulfillment teams.

FAQ

Square vs Stripe for a new app?

Square often fits sellers already on Square hardware; Stripe is common for pure online SaaS billing—choose based on seller ecosystem.

Can we sync Square catalog into our POS template?

Yes. Pull items and variations via Catalog API and keep Square IDs on your catalog entities.

How are refunds represented?

Listen for refund webhooks and update your order/payment records so ledgers stay consistent.

Build production software with Evonx

Start from a template or connect an existing repository. Evonx helps you ship real applications with preview, evolution threads, and pull-request delivery—not disposable demos.

Get started free