Looks Fine
4 questions/suggestions:
1) At SEPA withdrawal is "-", so you can't withdraw EUR using SEPA ?! You really should add this, cause Wire Transfer for 1%+55€ is insane
2) Why don't you offer OKPAY for transfers?
3) Trading API: Looks good
Do you have an API Call Limit? Like "800 calls per 10 minute"?
4) But I think you should improve your Order Cancel Response.
For an active aPI trader it is important to know the matched amount, without loosing time for making additional calls to check. Therefore you have to add at least the restamount in the response. The best would be to add all the information to the response you get from the Order Get Call. This is important.
Edit:
Translated my post into english, sry