code: public com.squareup.okhttp.Call postCharactersCharacterIdFittingsAsync(Integer characterId, String datasource,
              String token, CharacterFitting characterFitting, final ApiCallback<CharacterFittingResponse> callback)
              throws ApiException {
  
          com.squareup.okhttp.Call call = postCharactersCharacterIdFittingsValidateBeforeCall(characterId, datasource,
                  token, characterFitting, callback);
          Type localVarReturnType = new TypeToken<CharacterFittingResponse>() {
          }.getType();
          apiClient.executeAsync(call, localVarReturnType, callback);
          return call;
      }
docs: Create fitting (asynchronously) Save a new fitting for a character ---
  SSO Scope: esi-fittings.write_fittings.v1
  
  @param characterId
  An EVE character ID (required)
  @param datasource
  The server name you would like data from (optional, default to
  tranquility)
  @param token
  Access token to use if unable to set a header (optional)
  @param characterFitting
  (optional)
  @param callback
  The callback to be executed when the API call finishes
  @return The request call
  @throws ApiException
  If fail to process the API call, e.g. serializing the request
  body object