# Can you help me with integration Nylas v2 on Nylas v3

**URL:** <https://forums.nylas.com/t/can-you-help-me-with-integration-nylas-v2-on-nylas-v3/412>\
**Category:** Question and Answers\
**Tags:** authentication\
**Created:** [September 5, 2024, 4:19pm UTC](https://forums.nylas.com/t/can-you-help-me-with-integration-nylas-v2-on-nylas-v3/412 "2024-09-05T16:19:40Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Kateryna](https://avatars.discourse-cdn.com/v4/letter/k/b5a626/32.png) [@Kateryna](https://forums.nylas.com/u/Kateryna)\
**Post date:** [September 5, 2024, 4:19pm UTC](https://forums.nylas.com/t/can-you-help-me-with-integration-nylas-v2-on-nylas-v3/412/1 "2024-09-05T16:19:40Z")

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> **[Create grants with OAuth and an API key | Nylas Docs](https://developer.nylas.com/docs/v3/auth/hosted-oauth-apikey/?_gl=1*2efiy7*_gcl_au*MTkwOTAwMTY5Mi4xNzI1NTI2MDA4LjIwNjI2ODI1MzIuMTcyNTU0MDk1Ny4xNzI1NTQxMDEx*_ga*NTYzMzcxMjcwLjE3MTc3NDY3MzU.*_ga_5LVXVXFW0C*MTcyNTUyNjAwOC4xNS4xLjE3MjU1NTMxMDAuNjAuMC4w#start-an-authorization-request)**
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> Create grants using OAuth 2.0 and an API key in Nylas v3.

I realised this step but it doesnt work and I get issue **400: redirect\_uri\_mismatch**

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**Author:** ![Blag](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.nylas.com/blag/32/9_2.png) [@Blag](https://forums.nylas.com/u/Blag)\
**Post date:** [September 5, 2024, 9:01pm UTC](https://forums.nylas.com/t/can-you-help-me-with-integration-nylas-v2-on-nylas-v3/412/2 "2024-09-05T21:01:20Z")

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Hello @Kateryna Have you tried with the QuickStart guides? [Nylas Quickstart guides | Nylas Docs](https://developer.nylas.com/docs/v3/quickstart/#create-a-v3-sandbox-application)

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**Author:** ![Kateryna](https://avatars.discourse-cdn.com/v4/letter/k/b5a626/32.png) [@Kateryna](https://forums.nylas.com/u/Kateryna)\
**Post date:** [September 6, 2024, 10:10am UTC](https://forums.nylas.com/t/can-you-help-me-with-integration-nylas-v2-on-nylas-v3/412/3 "2024-09-06T10:10:22Z")

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I did it. Everything works.  
@Blag can help me make authorization. I don’t understand steps.  
The firs step is when I click button I redirect on Nylas and get access, then I return on my app and get code in url. What I need do with this code.

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<div class="post-metadata">

**Author:** ![Blag](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.nylas.com/blag/32/9_2.png) [@Blag](https://forums.nylas.com/u/Blag)\
**Post date:** [September 6, 2024, 11:02am UTC](https://forums.nylas.com/t/can-you-help-me-with-integration-nylas-v2-on-nylas-v3/412/4 "2024-09-06T11:02:49Z")

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@Kateryna Here’s a more depth example [Email API Quickstart: read and send email messages | Nylas Docs](https://developer.nylas.com/docs/v3/quickstart/email/)

Basically, once you created the grant, you can simply use the associated email to fetch emails, events or contacts.

BTW, are you trying to create a grant for yourself? Or do you want to provide access to other users? Because those are different things…

If you just want to create a Grant for yourself…read this guide [Start using the Nylas Sandbox | Nylas Docs](https://developer.nylas.com/docs/v3/getting-started/set-up/)

Then this one [Connect an account to Nylas | Nylas Docs](https://developer.nylas.com/docs/v3/getting-started/connect-account/#connected-accounts-and-grants)

And finally this one [Try the Nylas APIs! | Nylas Docs](https://developer.nylas.com/docs/v3/getting-started/try-apis/#make-a-sample-api-request)

Let me know if you have any other questions 🙂