code: func Decode(data string) ([]byte,error) {
  	data = strings.Replace(data, "-", "+", -1) // 62nd char of encoding
  	data = strings.Replace(data, "_", "/", -1) // 63rd char of encoding
  	
  	switch(len(data) % 4) { // Pad with trailing '='s
  		case 0:             // no padding
  		case 2: data+="=="  // 2 pad chars
  		case 3:	data+="="   // 1 pad char		
  	}
  		
  	return base64.StdEncoding.DecodeString(data)
  }
docs: // Decode decodes base64url string to byte array