401 Unauthorized error with correct credentials.

I followed the documentation and set up my API credentials as below:

public static Properties getMyMerchantDetails() {
		Properties props = new Properties();

		// HTTP_Signature = http_signature and JWT = jwt
		props.setProperty("authenticationType", "http_signature");
		props.setProperty("merchantID", "my_web_au");
		props.setProperty("runEnvironment", "apitest.cybersource.com");
		
		props.setProperty("merchantKeyId", "my_merchant_id");
		props.setProperty("merchantsecretKey", "my_sercret_key");
		props.setProperty("useMetaKey", "false");
		props.setProperty("enableClientCert", "false");

		return props;

	}

it gives me 401 unauthorized error:
Response{protocol=http/1.1, code=401, message=Unauthorized, url=https://apitest.cybersource.com/pts/v2/payments}

public static Properties getMerchantDetails() {
		Properties props = new Properties();

		// HTTP_Signature = http_signature and JWT = jwt
		props.setProperty("authenticationType", "http_signature");
		props.setProperty("merchantID", "testrest");
		props.setProperty("runEnvironment", "apitest.cybersource.com");
		props.setProperty("requestJsonPath", "src/main/resources/request.json");

		props.setProperty("useMetaKey", "false");

		// HTTP Parameters
		props.setProperty("merchantKeyId", "ggggggggggg");
		props.setProperty("merchantsecretKey", "gggggggggg");
		props.setProperty("enableClientCert", "false");
	
		return props;

	}

The above gives which is me 201 proper response.

I am sure my credentials are correctly created. Is there anything else I should add or modify to get past authorization?

Start by comparing the properties in getMyMerchantDetails() with the working getMerchantDetails() example, focusing on the merchant ID, key ID, secret key, authentication type, and run environment. Reproduce the request against https://apitest.cybersource.com/pts/v2/payments and verify that the corrected configuration returns the expected 201 response instead of 401 Unauthorized.