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 your website or on mobile web with a customised payment form or quickly embed a checkout experience into your site.
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 moment a customer inserts or taps 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 pre-configured with no additional steps necessary.

Every payment type

Process all major credit and debit cards and accept mobile-wallet contactless payments out of the box. This includes Apple Pay, Google Pay and Samsung Pay.

Dispute management

We have a dedicated disputes team to deal with the bank 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 working day. We also offer instant same-day deposits for an additional small fee.

Fraud detection

We use machine learning to analyse 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 APIs and SDKs are free for developers to use.

Square charges a processing fee on credit and debit transactions.

In-Person Transactions

1.75%
Per chip and pin or contactless payment

Online Transactions

2.5%
per transaction

Custom rate

Custom pricing packages may be available for large businesses depending on payment volume, average transaction size and more. We’d love to have a conversation about it.

Contact Sales >

Open source platforms supporting Square


Ready to get started?