client: improve CredirCard with constants and helpers
client: improve CredirCard with constants and helpers

Signed-off-by: Umut Sirin <4055abbc0e40a1254e715b952ccd414607e0b365@gmail.com>

kwagdy/koding-1,cihangir/koding,acbodine/koding,andrewjcasal/koding,rjeczalik/koding,szkl/koding,rjeczalik/koding,szkl/koding,gokmen/koding,gokmen/koding,koding/koding,andrewjcasal/koding,drewsetski/koding,usirin/koding,szkl/koding,drewsetski/koding,kwagdy/koding-1,usirin/koding,usirin/koding,cihangir/koding,koding/koding,drewsetski/koding,szkl/koding,sinan/koding,szkl/koding,kwagdy/koding-1,mertaytore/koding,gokmen/koding,drewsetski/koding,drewsetski/koding,andrewjcasal/koding,gokmen/koding,acbodine/koding,usirin/koding,mertaytore/koding,gokmen/koding,gokmen/koding,mertaytore/koding,sinan/koding,cihangir/koding,sinan/koding,andrewjcasal/koding,acbodine/koding,sinan/koding,andrewjcasal/koding,cihangir/koding,kwagdy/koding-1,cihangir/koding,koding/koding,cihangir/koding,rjeczalik/koding,szkl/koding,mertaytore/koding,rjeczalik/koding,koding/koding,rjeczalik/koding,koding/koding,mertaytore/koding,usirin/koding,drewsetski/koding,rjeczalik/koding,koding/koding,usirin/koding,gokmen/koding,rjeczalik/koding,acbodine/koding,sinan/koding,usirin/koding,kwagdy/koding-1,usirin/koding,rjeczalik/koding,drewsetski/koding,koding/koding,acbodine/koding,acbodine/koding,sinan/koding,drewsetski/koding,szkl/koding,gokmen/koding,sinan/koding,koding/koding,cihangir/koding,kwagdy/koding-1,acbodine/koding,cihangir/koding,kwagdy/koding-1,kwagdy/koding-1,andrewjcasal/koding,mertaytore/koding,mertaytore/koding,acbodine/koding,mertaytore/koding,sinan/koding,andrewjcasal/koding,andrewjcasal/koding,szkl/koding