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Building Your Mobile Integration

Finix offers the following mobile in-person payments integrations:

  1. Tap to Pay on iPhone: Accept contactless payments directly on iPhone with no card reader or extra hardware.
  2. PAX D135 Android SDK: Connect a PAX D135 Bluetooth card reader to your Android app.
  3. PAX D135 iOS SDK: Connect a PAX D135 Bluetooth card reader to your iOS app.

Tap to Pay on iPhone integrations

Tap to Pay on iPhone Branding

Accept contactless payments on iPhone with no card reader or extra hardware using the Finix Tap to Pay on iPhone SDK.

For additional details on the Tap to Pay on iPhone SDK, see Tap to Pay on iPhone Overview.

PAX D135 integrations

The D135 connects via Bluetooth and supports Tap, Insert, and Swipe payments without a dedicated terminal. Finix provides native SDKs for both Android and iOS to handle device pairing, payment processing, and receipts.

PAX D135 Bluetooth card reader with Finix branding

Read the PAX D135 Overview to learn more about the PAX D135's capabilities.

Environment designation

When ordering a PAX D135, specify whether each Device is designated for Sandbox or Production. Finix provides you with the serial number assigned to each Device.

Device Designation

A D135 Device can be designated for either Sandbox development or Production transaction processing but not both. We recommend requesting enough devices to utilize in both your Sandbox development and Production testing.

Prerequisites

  • Your PAX D135 device is fully charged.
  • For Android devices: Android 8.0 (API level 26) or higher.
  • For iOS devices: iOS 18.1 or higher.
Charging the Device

Charge the battery only with PAX-approved power supplies. Using others may damage the product and void the warranty.

Charging time must not exceed 24 hours. If the battery is empty, recharge it fully, then disconnect the device to avoid shortening its life.

Device limits

The D135 card reader accepts payments via Tap, Insert, or Swipe. You can accept Tap payments for amounts under $1,000. For larger amounts, insert the card into the card reader.

Next steps

Integration Prerequisites

Complete the prerequisite steps for integrating the PAX D135 with the Finix Android or iOS SDK.

Android SDK

Install and initialize the Finix Android SDK, connect to your D135, and process your first transaction.

iOS SDK

Install and initialize the Finix iOS SDK, connect to your D135, and process your first transaction.

Tap to Pay on iPhone

Accept contactless payments on iPhone with no card reader or extra hardware using the Finix Tap to Pay on iPhone SDK.

Android Demo App

Explore a sample Android app built with the Finix mobile SDK and PAX D135.

iOS Demo App

Explore a sample iOS app built with the Finix mobile SDK and PAX D135.