API Gateway to SNS publish

It seems like you're encountering an "InvalidClientTokenId" error when calling your API Gateway REST API. This error typically occurs when the AWS credentials used to invoke the API are invalid or expired. Here's how you can

troubleshoot and resolve this issue:

1.Verify IAM Role and Permissions: Double-check that the IAM role assigned to your API Gateway has the correct permissions for accessing SNS.

2.Review API Gateway Integration: Ensure that the integration between API Gateway and SNS is properly configured, including the IAM role used for execution.

3.Check SNS Topic Policy: Confirm that the SNS topic policy allows API Gateway to publish messages to the topic.

4.Test API Invocation: Use valid AWS credentials to test the API invocation and ensure there are no issues with authentication.

5.Check AWS Region: Ensure you're calling the API in the correct AWS region where your resources are located.

6.Monitor CloudTrail Logs: Review CloudTrail logs for any additional insights into the authentication failure.

i hope this will be resolve your issue.

Hlo

Please check once below

1.Check IAM Role Permissions: Ensure that the IAM role assigned to your API Gateway has the necessary permissions to interact with SNS. In this case, he role should have the sns:Publish permission to publish messages to the SNS topic.

2.Verify API Gateway Configuration: Double-check the configuration of your API Gateway, especially the integration with SNS. Ensure that the integration settings are correct and that the API Gateway is using the correct IAM role to access SNS.

3.Verify SNS Topic Policy: Review the policy attached to the SNS topic to ensure that it grants the necessary permissions to the API Gateway. The policy should allow the API Gateway to publish messages to the topic.

4.Check API Gateway Logs: Check the logs in API Gateway to see if there are any additional details or error messages that could provide insights into the issue. Look for any authorization failures or other relevant information.

5.Verify API Gateway Deployment Stage: Ensure that you're testing the API in the correct deployment stage (e.g., "dev", "prod"). If you recently made changes to the API Gateway configuration, make sure those changes are deployed to the correct stage. Check AWS Region: Make sure that both the API Gateway and the SNS topic are in the same AWS region. Cross-region communication might require additional configurations.

6.Test with Correct Credentials: Double-check that you are using valid AWS credentials when making the API request. Ensure that you're using the correct access key and secret key, and that they are associated with an IAM user or role that has the necessary permissions.

7.Retry the Request: Sometimes, transient issues can cause authentication failures. Retry the request after ensuring all configurations are correct.