Order History Question

I have a problem to create an application. The issue is this: I'm doing with the tools of a site webassit a real estate or construction company. The idea is to have an administrator enter information where every buyer of a house that is paid in installments. Then the idea is also that the buyer can access a personal page using Security Assist which reflects their current situation of paying tuition, etc., data to be entered by the site administrator at a time. So, in this case do not use eCart because nothing is sold online, but if I need to do the history of each buyer so that the person can access to see the construction progress and status of your monthly payment. My question is how to apply Security Assist once given by the administrator username and password, each person can enter their own. I have watched the tutorial on how to make a purchase history, but it confuses me a little because the target is another. I do not know if you understand the proposition. From and appreciate any comments to help me get this straight

first you would need a table for users where they will have a user Id number the auto incrimental int field and primary field of the table from there if you use only one table for all you can give them levels example of the table

USERID -------- INT 11 autonumeric and primary
NAMES -------- VARCHAR 150 not null
EMAIL -------- VARCHAR 150 not null
USERNAME ---- VARCHAR 100 not null
PASSWORD --- VARCHAR 100 not null
LEVEL --------- TINYINT default 2

Now when you use security assist you can asign for admin lvl has to be = 1
Normal user lvl = 2

This way you can filter wich user is an admin and wich is a normal user now for the history of each user the history table should have a related field in the database example

HISTORYID ----- INT 11 etc...
USERRELID ----- INT 11 not null
REST OF FIELDS for history

having a field to relate with the user tables is the key when you add a history u have to place the USERID then you can use session filters when creating the query to show the filter tell it to filter the list or data by $_SESSION['USERID'] to the field we named before as the related to that user, so your list of history will show for those logged users only with thier data, the rest of the data wont show

Remeber to check on security assist the sessions it creates for your user id

good luck let us know how it worked for you.

Thanks Sade for your help!! i'm apreciate that!