Good day @Farahaanmahamm7,
Thank you for posting to the PayPal community.
I would suggest to please refer the below guide links and pass valid request to PayPal system.
https://developer.paypal.com/api/nvp-soap/paypal-payments-standard/integration-guide/Appx-websitesta...
https://developer.paypal.com/api/nvp-soap/paypal-payments-standard/gs-PayPalPaymentsStandard/
Sample HTML button code : Use the following samples as a starting point to create your own HTML payment button code:
https://developer.paypal.com/api/nvp-soap/paypal-payments-standard/integration-guide/sample-code-lan...
Sincerely,
Chiranjeevi
PayPal/Braintree MTS
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