Square Developer

Focus on your code. We’ll handle payments.

Secure and PCI-compliant APIs and SDKs for your payments needs.

Omnichannel, multichannel—call it what you want. Take payments wherever your customers are.

Take online payments.

Take payments on a website or on mobile web with a customized payment form, or quickly embed a checkout experience into a website.
Square Payment Form >

Take in-person payments.

Use Square hardware to take in-person, card-present payments. Build a custom point of sale, or any other in-person payment solution.
Square POS API >

Integrate with existing systems.

Transfer payments data into a CRM, OMS, ERP, or any enterprise business solution.
View Square’s APIs >

Rely on the payment platform that has processed billions of transactions.

PCI and EMV compliance

Our hardware and software are compliant with PCI Data Security Standard (PCI-DSS) and EMV regulations. We take on the burden of staying compliant, which means you don’t have to worry about assessment fees or potential expensive data breach fines.

End-to-end encryption

From the time the customer dips or swipes a credit card, the data is encrypted until it reaches Square’s processing environment. Customer data never touches the seller’s servers. And it’s all preconfigured, with no additional steps necessary.

Dispute management

We have a dedicated disputes team to deal with your credit card issuer for you. We’ll ask for the documentation we need and take care of the rest with no additional fees.

Fast deposits

Get your money faster with Square’s deposits as soon as the next business day.

Fraud detection

We use machine learning to analyze every payment in our ecosystem. It enables us to prevent fraud on sellers’ behalf, regardless of the payment volume they are processing.

Understand your customers, sales, inventory, and more.

Easily make informed decisions with a complete view of your inventory, customers, and products across all of your online and in-person sales.
Customers API >
Catalog API >
Inventory API >

Create unlimited solutions including:

  • Custom points of sale
  • Line-busting mobile solutions
  • Online checkout experiences
  • Customer management solutions
“Square offers us a way to think outside the box in terms of what’s possible for transactions and experiences in-Shack. We’re freed from the restrictions put on us by legacy products, and the Square suite of tools enables a variety of new opportunities.”

– Anoop Pillarisetti, Digital Product & Strategy at Shake Shack

Square APIs and SDKs are free for developers to use.

Square charges a processing fee on credit and debit transactions.

In-Person Transactions


Online Transactions

Per transaction

Need more information?

We can help you to find the best way to leverage Square for your business.

Contact Sales >

Open-source platforms supporting Square

Ready to get started?