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Vonage/Nexmo Invalid Signature

The request signature does not match the expected value.

Understanding Vonage/Nexmo SMS Communication API

Vonage, formerly known as Nexmo, provides a robust SMS Communication API that allows developers to integrate SMS capabilities into their applications. This tool is essential for sending and receiving SMS messages globally, enabling businesses to communicate effectively with their customers.

Identifying the Symptom: Invalid Signature

When working with the Vonage/Nexmo API, you may encounter an 'Invalid Signature' error. This error typically appears when the request signature does not match the expected value, preventing successful API communication.

Exploring the Issue: What Causes Invalid Signature?

Understanding Request Signatures

Request signatures are used to verify the authenticity of requests sent to the API. They ensure that the request has not been tampered with and is from a legitimate source.

Common Causes of Invalid Signature

The most common cause of an invalid signature is an incorrect signing of the request. This can occur due to an incorrect API secret or improper signature generation.

Steps to Resolve the Invalid Signature Error

Step 1: Verify API Credentials

Ensure that you are using the correct API key and secret. You can verify your credentials in the Vonage Dashboard.

Step 2: Correctly Sign the Request

Follow these steps to correctly sign your request:

  1. Concatenate the request parameters in alphabetical order.
  2. Use your API secret to generate an HMAC SHA-256 hash of the concatenated string.
  3. Include the generated signature in your API request.

Refer to the Vonage API Documentation for detailed instructions on signing requests.

Additional Resources

For further assistance, consider exploring the following resources:

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