MCP Allowlist Request - Dualentry.com

MCP
1

Hi

At DualEntry we’re building an AI accounting and ERP platform with an agent that’s also an MCP client. We’d like to be able to connect to Square on our customers’ behalf.

Please whitelist our redirects URLs:

https://app.dualentry.com/integrations/mcp/callback
https://uat.dualentry.com/integrations/mcp/callback
https://dev.dualentry.com/integrations/mcp/callback
4

@mykhaylo - Acknowledging your request - we’re processing it on our side, and I’ll revert shortly to confirm access.

5

@mykhaylo - confirming your URLs are now whitelisted.

6

@jseok can you please add trailing slash to the URLs?

https://app.dualentry.com/integrations/mcp/callback/
https://uat.dualentry.com/integrations/mcp/callback/
https://dev.dualentry.com/integrations/mcp/callback/
7

The allowlist is domain-based, so the requested domains are already covered regardless of whether the callback URLs have trailing slashes. Could you confirm where the trailing-slash requirement is coming from and share the error you’re seeing?

If this is an exact redirect URI mismatch, it should likely be resolved by registering and consistently using the same URI on the client side.

8

Can you verify if URLs are whitelisted ? I get this when trying to connect

status:400
err: {“error”:“invalid_redirect_uri”,“error_description”:“Invalid redirect URI: https://dev.dualentry.com/integrations/mcp/callback/ - domain not in allowlist”

9

Your domains should be whitelisted - there was some miscommunication internally. Please try again and let me know if you still see the error!