computeSignature method
Implementation
@visibleForTesting
String computeSignature(String totalParams) {
_log('computeSignature($totalParams)');
List<int> hmacInput = utf8.encode(apiSecretKey!);
final hmacSha256 = Hmac(sha256, hmacInput); // HMAC-SHA256
final totalParamsBytes = utf8.encode(totalParams);
final signature = hmacSha256.convert(totalParamsBytes);
_log('signing request with: $signature');
return '$signature';
}