Hey @Sujit,
The error message "Token validation failed" with status code 401 indicates that there is an issue with your token or the way it is being validated. Here are a few steps to troubleshoot and resolve this issue:
1. Check API Key and Shared Secret: Ensure that you are using the correct API key and shared secret provided by Visa.
2. Header Parameters: Verify the header parameters, especially the `iat` (issued at) timestamp. The timestamp should be in milliseconds and should be current.
3. JWT Token: Ensure that your JWT token is correctly formatted and signed.
4. Encryption: Make sure the payload encryption is done correctly. You can cross-check with the example provided by Visa.
5. Certificate: Ensure that the certificate used for encryption and signing is the correct one provided by Visa.
Here is an example of how you might construct your request in Postman:
### Headers
```json
{
"Content-Type": "application/json",
"Authorization": "Bearer YOUR_JWT_TOKEN",
"alg": "RSA-OAEP-256",
"enc": "A128GCM",
"iat": "YOUR_CURRENT_TIMESTAMP",
"kid": "YOUR_KEY_ID"
}
```
### Body
```json
{
"encData": "YOUR_ENCRYPTED_DATA"
}
```
Example Code Snippet for Generating JWT Token
Ensure that you are generating the JWT token correctly. Here is an example in Python:
```python
# START
import jwt
import time
# Replace with your actual values
api_key = 'YOUR_API_KEY'
shared_secret = 'YOUR_SHARED_SECRET'
key_id = 'YOUR_KEY_ID'
# Current timestamp in milliseconds
iat = int(time.time() * 1000)
# JWT payload
payload = {
"apiKey": api_key,
"iat": iat
}
# Encode the JWT token
token = jwt.encode(payload, shared_secret, algorithm='HS256', headers={"kid": key_id})
print(token)
# END
```
Important Points to Verify:
1. Timestamp (`iat`): Ensure it is current.
2. Shared Secret: Must be the correct one.
3. Algorithm and Headers: Ensure they match Visa's requirements.
4. Encoding and Encryption: Verify the correctness of payload encryption.
Thanks,
Diana
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