asp.net - PayPal IPN Sandbox response always INVALID -

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i'm trying implement paypals ipn on website in asp.net using c#. using sample code given paypal found here: https://cms.paypal.com/cms_content/gb/en_gb/files/developer/ipn_asp_net_c.txt

i have enabled ipn on account url of ipn on site. url used in code can see in link above sandox url paypal testing.

i using ipn simulator , it's giving me "ipn sent response" on website displays invalid every time.

i have tried displaying strrequest string in label , shows me "&cmd=_notify-validate" without quotes. thought meant add part on rest of returned data paypal.

here button:

this button i'm using

<script src="paypal-button.min.js?merchant=myemail"                  data-button="buynow"                  data-name="name"                  data-quantity="1"                  data-amount="00.50"                  data-currency="gbp"                  data-shipping="0"                  data-tax="0"                  data-env="sandbox"                 data-return="http://site.net/thankyou.aspx"                 ></script>

what going wrong?

update:

so.. recap. have 2 sandbox accounts. 1 business , other personal. enabled ipn on business account. on website have button shown above. ipn page has exact same code sample code given ipn in asp.net paypal. got website, click buy button , make purchase using personal account sandbox business account. payment shows complete , shows sent code 200 in ipn history business account when check label entered on ipn page shows word invalid.

thanks!


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