This has been a common issue with blockchain.info's receive payments API.  It all started a few months ago when the "stress tests" began. Since they offered free payment forwarding I believe someone was misusing the Receipt Payments API service to fill up the blockchain with spam.
Your transaction will go through, it's just a matter of when. You might want to try to find another payment forwarding service like block.io or blockcypher since blockchain's is no longer reliable.