# Unable to download the ReaderSDK

**URL:** <https://developer.squareup.com/forums/t/unable-to-download-the-readersdk/5298>\
**Category:** Questions\
**Created:** [March 2, 2022, 1:25pm UTC](https://developer.squareup.com/forums/t/unable-to-download-the-readersdk/5298 "2022-03-02T13:25:14Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Pieter](https://avatars.discourse-cdn.com/v4/letter/p/82dd89/32.png) [@Pieter](https://developer.squareup.com/forums/u/Pieter)\
**Post date:** [March 2, 2022, 1:25pm UTC](https://developer.squareup.com/forums/t/unable-to-download-the-readersdk/5298/1 "2022-03-02T13:25:14Z")

</div>

Hi there,

We are a POS Provider from South Africa and we have had requests from some of our clients in the US to integrate with Square. I have a few questions regarding the Reader SDK.

1. I’m trying to download the ReaderSDK, but I keep getting the response “Invalid Credentials”. I am using the sandbox credentials provided in the Developer Portal.

```auto
ruby <(curl https://connect.squareup.com/readersdk-installer) install \
--app-id [my app id] \
--repo-password [my repo password]

  % Total % Received % Xferd Average Speed Time Time Time Current
                                 Dload Upload Total Spent Left Speed
100 12576 100 12576 0 0 10812 0 0:00:01 0:00:01 --:--:-- 10878
Checking available versions ...
Invalid credentials. Please make sure that you have provided the correct Reader SDK repository credentials from the Square Developer Portal.

```

Is this because I’m located out of the US? If this is the case, will someone be able to assist me to get a copy of the Reader SDK?

1. Are the SDK’s that we will use generated on a per Application ID basis? Will we be able to use a single version of the SDK of all of the clients, or will we need separate SDK’s for each of them?

Kind Regards,  
Pieter

---

<div class="post-metadata">

**Author:** ![Bryan-Square](https://sea1.discourse-cdn.com/square/forums/user_avatar/developer.squareup.com/bryan-square/32/38_2.png) [@Bryan-Square](https://developer.squareup.com/forums/u/Bryan-Square)\
**Post date:** [March 2, 2022, 4:18pm UTC](https://developer.squareup.com/forums/t/unable-to-download-the-readersdk/5298/2 "2022-03-02T16:18:06Z")

</div>

👋 With Square the Reader SDK and Point of Sale API are not currently supported in the Square Sandbox and Square hardware only works in Square-supported countries. As a result, mobile developers of in-person applications must test in production with real credit cards. If you are a developer trying to build with a Square in-person mobile solution in supported regions, you should:

- **Start with cash.** You can test cash payments without spending actual money using the `CASH` tender type.

Additionally, since your building an application to be used by many sellers you’ll [OAuth](https://developer.squareup.com/docs/oauth-api/overview) and [Mobile Authorization](https://developer.squareup.com/docs/mobile-authz/what-it-does) to connect to other Square merchants. 🙂