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Question

Lemon Squeezy OAuth connection returns 400 Bad Request

  • September 29, 2026
  • 3 replies
  • 77 views

I am trying to connect my Lemon Squeezy store  to Zapier.

The connection process works normally until the authorization step:

Zapier → Lemon Squeezy → Connect → Authorization Request → Authorize

After I click “Authorize”, Lemon Squeezy immediately returns:

“Oops! An Error Occurred. The server returned a 400 Bad Request.”

I have already tried:

  • Connecting from inside a Zap
  • Connecting directly from Zapier → Connections → Create connection
  • Chrome Incognito mode
  • Without browser translation

The same 400 Bad Request occurs every time.

Could you please check whether there is an OAuth authorization issue with my Lemon Squeezy account/store or the Zapier integration?

Thank you.

    3 replies

    Troy Tessalone
    Zapier Orchestrator & Solution Partner
    Forum|alt.badge.img+14
    • Troy TessaloneZapier Orchestrator & Solution Partner
    • Zapier Orchestrator & Solution Partner
    • September 29, 2026

    Hi ​@Asa 

    Help link for using Lemon Squeezy in Zaps: https://docs.lemonsqueezy.com/help/integrations/zapier

     

    Help link for opening a ticket with Zapier Support: https://zapier.com/app/get-help

    ⚡ Troy Tessalone - AutomationAce.com | Top Zapier Solution Partner | #1 Zapier Community Contributor
    SamB
    Community Manager
    Forum|alt.badge.img+11
    • SamBCommunity Manager
    • Community Manager
    • October 6, 2026

    Hi ​@Asa 👋

    Just came across this and saw you got in touch with our Support team, who suggested trying a different browser. Sharing their suggestions here in case it's helpful for anyone else running into the same error:

    Here are a few more things to try:

    1. Log into Lemon Squeezy first in the same browser, then attempt the Zapier connection.
    2. Try a different browser entirely (not just Incognito mode) to rule out browser-specific issues.
    3. Remove failed connections by going to zapier.com/app/connections, deleting any broken Lemon Squeezy connections, then reconnecting fresh.

     
    If these steps don't resolve it, the next step is to reach out to Lemon Squeezy support directly. Ask them to verify that:

    • OAuth/API access is enabled for your account
    • Third-party integrations are enabled
    • There are no recent changes or restrictions on your store


    Did trying a different browser do the trick, or did you reach out to Lemon Squeezy to look into it further? Let us know if you’re still stuck at all! 🙂

    SamB's steps are a great starting point, particularly logging into Lemon Squeezy first in the same browser before attempting the connection. Deleting failed connections and starting fresh also clears stale tokens that sometimes cause this. If a different browser does not fix it, asking Lemon Squeezy support to confirm OAuth access is enabled for your account is the next step. This often turns out to be a setting on their side rather than anything on yours.

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