PayPal is updating its card reader — called PayPal Here —  to work for the first time with devices running Windows, as part of a mobile point-of-sale alliance with Microsoft.

Devices including the Surface Pro 3 tablet and Lumia 830 and 635 smartphones, which all run Windows 8.1, will soon support the PayPal debit and credit card reader.

In fact, Microsoft will offer a complete package (Surface tablet, PayPal Here app and card reader and POS hardware) through its own stores later this year.

PayPal Here, which was launched in 2012, already supports iOS and Android.

This week also saw the unveiling of a rival mobile point-of-sale line-up between Samsung and Verifone based on Android. Mind you, PayPal and Microsoft’s pitch is more at small businesses, while the rival partnership is more intent on hitting large retailers.

A PayPal Here SDK is already available for select Windows developers to embed in their apps. These include Canvas and iConnectPOS who aim to introduce new software in the coming months.

Previously, the payments firm ran a trial for iOS and Android SDKs, which will officially launch later this month.

Finally, and separate from its Microsoft alliance, PayPal will add EMV (chip and PIN) capability to its card reader in the US later this year, working with Android, iOS and Windows devices. The US is a relatively later adopter of EMV technology, having previously stuck with magnetic stripe technology for a long time. PayPal Here already works with EMV cards in the UK and Australia.

PayPal says that the new reader, due later this year, will allow EMV and contactless transactions via Bluetooth and will support “any chip card, magnetic stripe card, or contactless payment form, including mobile wallets.”