> For the complete documentation index, see [llms.txt](https://onestore-dev.gitbook.io/dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://onestore-dev.gitbook.io/dev/eng/tools/billing.md).

# Payment Integration Guide

### **ONE store developer center API** <a href="#tools-onestoredevelopercenterapi" id="tools-onestoredevelopercenterapi"></a>

We at ONE store provide Android Software development kits (SDK) and resources (API) which Android developers can use.\
We continue our efforts to expand the scope of support for the developers.

| API V7 (SDK V21) \*latest version                                                |
| -------------------------------------------------------------------------------- |
| [ONE store IAP API V7 (SDK V21) Guide & Download](/dev/eng/tools/billing/v21.md) |

| Old version IAP Guide                                                        | <p><br></p>                      |                                  |
| ---------------------------------------------------------------------------- | -------------------------------- | -------------------------------- |
| [ONE store IAP API V6 (SDK V19) ](/dev/eng/tools/billing/old-version/v19.md) | ONE store In-App API V5(SDK V17) | ONE store In-App API V4(SDK V16) |

### **ONE store 3rd party payment guide** <a href="#tools-onestore3rdpartypaymentguide" id="tools-onestore3rdpartypaymentguide"></a>

In addition to ONE store IAP, ONE store support 3rd party payment method too.\
The 3rd party payment is an enabler for payment service provided by the seller through 3rd party Payment Gateway (PG),\
such as PayPal, without ONE store’s in-app payment module (in-app SDK).

| Developer Guide                                                   |
| ----------------------------------------------------------------- |
| [Billing\_3rd party](/dev/eng/tools/billing/billing_3rd-party.md) |


---

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