Greetings sir,
I have read your project description, and in terms of features it seems fairly straight forward.
But we'll need more information.
Methods of payment are what usually is the main focus in website work, for it differs from Pay Pal as a "middle man" in purchases online, or some other services that serve the same purpose or it requires direct work with Bank to provide direct Credit Card usage. Again security must be top priority in that case. Alternatively Western Union is usually the most direct way for payments but it does take fee as well for their services.
There is also design work to be considered.
Do bare in mind final time frame or possibly the bid could variate in terms of time frame as well as fee if project's complexity is exceeding the initial bid.
Free demos are our good practice, so we could offer a one. It would help you, in your review to help reassure you in quality of the product we offer.
As for our expertise, we are team of 15 European PHP experts /Web / iOS / Android developers, all experienced in their field of work. Quality is our main goal, for the purpose of being team of choice for our employers should they need any IT work done again.
If you have any questions please do not hesitate to contact us.