public Builder token(String token) {
   request.setToken(token);
   return this;
 }
 public Builder credentials(String credentials) {
   request.setCredentials(credentials);
   return this;
 }
 public Builder description(String description) {
   request.setDescription(description);
   return this;
 }
 public Builder amount(int amount) {
   request.setAmount(amount);
   return this;
 }
 public Builder to(String to) {
   request.setTo(to);
   return this;
 }
 public Builder from(String from) {
   request.setFrom(from);
   return this;
 }