cc_seq_fetch_creds_next
err = cc_seq_fetch_creds_next(context, &creds, iterator);
err = cc_seq_fetch_creds_next(context, &creds_array[i], iterator);
err = cc_seq_fetch_creds_next(context, &creds, iterator);
err = cc_seq_fetch_creds_next(context, &creds, iterator);
cc_seq_fetch_creds_next (apiCB *in_context,
cc_seq_fetch_creds_next(