Buying stuff in SFV with FM

So I'm buying a color (SICOL00000041) with FM

Request:

POST /bentov2/sf5/contents/1416513040/shop/purchasecontent HTTP/1.1
Cookie: *** AUTH STUFF ***
Content-Type: application/x-www-form-urlencoded
Content-Length: 36
User-Agent: game=KiwiGame, engine=UE4, version=0
Host: api.prod.capcomfighters.net
Connection: Keep-Alive
Cache-Control: no-cache

content_id=SICOL00000014&currency=fm

Response:

HTTP/1.1 200 OK
Date: Thu, 14 Jul 2016 23:36:07 GMT
Server: Apache/2.4.6 (CentOS)
Content-Length: 435
Content-Type: text/html; charset=utf-8
Keep-Alive: timeout=3, max=100
Connection: Keep-Alive

{"common":[{"otid":"** HIDDEN **", "puid":"** HIDDEN **", "urid":"** HIDDEN **", "pfid": "** HIDDEN **", "mcmd":"myinfo", "scmd":"shop", "sbvr":"purchasecontent", "kwrd":"none", "mthd":"POST", "loip":"**ID**", "puip":"** HIDDEN **", "urgn": "---", "apiv":"** HIDDEN **", "natt":"0", "atyp":""}], "response":[{"purchase_result":{ "success":"1", "errorcode":"0", "currency":"fm", "content_id":"SICOL00000014", "fm":"** HIDDEN **", "rm":"0" }}]}