Direct link to form function from external page
I like to make a direct link to the supplier review page
/OA_HTML/OA.jsp?page=/oracle/apps/pos/supplier/webui/SuppSummPG&OAHP=POS_HT_SP_HP&OASF=POS_HT_SP_B_SUPP&OAPB=AP_PAY_PRODUCT_BRAND
I am logged in through apps, but I cannot access this page directly, because it expects the call like
/OA_HTML/RF.jsp?function_id=2252&resp_id=56714&resp_appl_id=200&security_group_id=0&lang_code=NL¶ms=C8KZ52CTm6cWr.NdOgbniFm-5tXlFmL4TCgeSjrKWaw&oas=aa5ClpHL_ug1UPjMgxopDw..
How do I encode this to call the correct function? Especially the encoding of params of course ..