生成Walmart Canada WM_SEC.AUTH_SIGNATURE及调用订单API遇授权问题求助

• 调用加拿大沃尔玛订单API（目标端点：https://marketplace.walmartapis.com/v3/ca/orders）时授权失败
• 已尝试通过官方文档提供的JAR文件生成WM_SEC.AUTH_SIGNATURE及时间戳，但请求时返回如下错误：

{"error":[{"code":"UNAUTHORIZED.GMP_GATEWAY_API","field":"UNAUTHORIZED","description":"Unauthorized","info":"Unauthorized token or incorrect authorization header. Please verify correct format: \"Authorization: Basic Base64Encode(clientId:clientSecret)\" For more information, see https://developer.walmart.com/#/apicenter/marketPlace/latest#apiAuthentication.","severity":"ERROR","category":"DATA","causes":[],"errorIdentifiers":{}}]}

• 自行编写代码生成签名后，问题仍未解决，恳请协助排查订单API调用的授权问题

内容的提问来源于stack exchange，提问作者Renan Michel Hardt