create dynamic billing button - php

Question

I want to create dynamic billing button using paypal
when I used create button at the paypal.com it generate a button for me :
<form action='https://www.paypal.com/cgi-bin/webscr' method='post' target='_top'>
<input type='hidden' name='cmd' value='_s-xclick'>
<input type='hidden' name='hosted_button_id' value='BFKATLSGW6CTW'>
<input type='image' src='https://www.paypalobjects.com/en_US/i/btn/btn_buynow_LG.gif' border='0' name='submit' alt='PayPal - The safer, easier way to pay online!'>
<img alt='' border='0' src='https://www.paypalobjects.com/en_US/i/scr/pixel.gif' width='1' height='1'>
</form>
but it's with a static price
I tried to add a hidden input
<input type="hidden" name="amount" value="5.95">
but the price still static
I tried the automatic billing throw the paypal.com
but I got
You need to have a PayPal Business account and the Enhanced Recurring Payments package to create Automatic Billing or Installment Plan buttons
I viewd my profile and created a business app for it , but the message still the same
My last try to use this form
<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<!-- Identify your business so that you can bill for payments. -->
<input type="hidden" name="business" value="BLWHUxxxxxx"> <!-- I put my merchant id---->
<!-- Specify an Automatic Billing button. -->
<input type="hidden" name="cmd" value="_xclick-auto-billing">
<!-- Specify details about the automatic billing plan. -->
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="item_name" value="Regular House Cleaning">
<input type="hidden" name="max_text" value="Regular House Cleaning">
<input type="hidden" name="set_customer_limit" value="max_limit_own">
<input type="hidden" name="min_amount" value="1.00">
<!-- Make sure you get the buyer's address during checkout. -- >
<input type="hidden" name="no_shipping" value="2">
<!-- Display the description and a text box to enter the maximum. -->
<table>
<tr>
<td><strong> </strong></td></tr>
<tr><td>
</td></tr>
<tr><td>$
<input type="hidden" name="amount" value="5.95">
<input type="text" name="max_amount" value="1000"> USD</td></tr>
<!-- Inform buyers of the monthly minimum payment -->
<tr><td> </td></tr>
</table>
<!-- Display the Automatic Billing button -->
<table>
<tr><td><input type="image" border="0" name="submit" src="https://www.paypalobjects.com/en_US/i/btn/btn_buynow_LG.gif"
alt="PayPal - The safer, easier way to pay online!"></td></tr>
</table>
<img alt="" border="0" width="1" height="1" src="http://www.paypalobjects.com/en_US/i/btn/btn_buynow_LG.gif" />
</form>
but the result is
This merchant is no longer authorized to offer this Autobilling plan.Please contact the merchant or choose another product.
any recommendations to have a script that take the price from the database to let the customer pay for the the services !

Answer 1

You are using Hosted button. It is not possible to over-write the amount value in Hosted Button . You can can clear text button to over-write the amount variable.
When you create a button in Paypal, make sure you uncheck the option "Save button at PayPal" in Step 2 . This makes the button "Clear Text" and provides option to over-write any variable using your custom logic.Automatic billing,Installments button work only if you have Enhanced Recurring Payments ERP