pass paramter multi_select and single select jasper report from oracle apex

DECLARE
  v_blob                 BLOB;
  v_file_type            VARCHAR2 (25) := 'pdf';
  v_file_name            VARCHAR2 (25) := 'WaterLevel_12.'||v_file_type;
  v_vcContentDisposition VARCHAR2 (25)  := 'inline';
 v_D1 date :=:P21_START_DATE;
 v_D2 date  :=:P21_END_DATE; 
 v_STA VARCHAR2(100) :=:P21_STATION;
 v_AREA VARCHAR2(100) :=:P21_AREA;
 v_USER VARCHAR2(160) :=:P0_USERNAME;
 -----v_SEN VARCHAR2(100) :=:P21_SENSOUR_S;
 
 --v_SEN  NUMBER :=:P21_SENSOUR_S;
  v_hostname   VARCHAR2(100) := 'localhost'; 
  v_port       NUMBER       := '9006'; 
  v_username   VARCHAR2(50) := 'jasperadmin'; 
  v_password   VARCHAR2(50) := 'jasperadmin'; 
  v_jasper_string VARCHAR2(30) := v_username || ';' || v_password;
  v_jasper VARCHAR2(220)  := v_D1 || ';' || v_D2 || ';' || v_STA || ';' || v_AREA || ';' || v_USER;
  v_login_url  VARCHAR2(100) := 'http://' || v_hostname || ':' || v_port || '/jasperserver/rest/login';
  v_report_url VARCHAR2(100) := 'http://' || v_hostname || ':' || v_port || '/jasperserver/rest_v2/reports/reports/' || v_file_name;

BEGIN
  -- log into jasper server
  v_blob := apex_web_service.make_rest_request_b(
    p_url => v_login_url,
    p_http_method => 'GET',
    p_parm_name => apex_util.string_to_table('j_username;j_password',';'),
    p_parm_value => apex_util.string_to_table(v_jasper_string,';')

  );

  -- download file

    v_blob := apex_web_service.make_rest_request_b(
    p_url => v_report_url,
    p_http_method => 'GET',
   p_parm_name => apex_util.string_to_table('P_D1;P_D2;P_STA;P_AREA;P_USER',';'),
   p_parm_value => apex_util.string_to_table(v_jasper,';')

  );

 --OWA_UTIL.mime_header ('application/pdf', FALSE);  -- view your pdf file

  OWA_UTIL.MIME_HEADER( 'application/octet', FALSE ); -- download your pdf file

  HTP.p('Content-Length: ' || DBMS_LOB.GETLENGTH(v_blob));

  HTP.p('Content-Disposition: ' || v_vcContentDisposition ||'; filename="' || v_file_name || '"');

  OWA_UTIL.http_header_close;

  WPG_DOCLOAD.DOWNLOAD_FILE(v_blob);

  APEX_APPLICATION.STOP_APEX_ENGINE;

END;