Billing stored procedure

We need PostgreSQL stored procedure for the purpose of billing customer's sms messages. Database contains credit amount for each user (users table) and price for each user and destination (billing table). The procedure accepts message of each user, checks in the database if user has enough credit to send to the specific destination, then checks if user has permission to send to that destination (checks billing table) and stores the message in queue table if those conditions satisfied, otherwise rejects the message. Database table samples will be available to approved coders. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Linux 2.6.16.21-0.25-bigsmp PostgreSQL 8.2.0