curl --location -g --request POST '{{success_url}} or {{failure_url}}' \
--form 'pg_order_id="123456789"' \
--form 'pg_payment_id="12345"' \
--form 'Merchant parameters="";type=* All fields passed from the merchant's website that do not have the pg_ prefix.' \
--form 'pg_salt="some random string"' \
--form 'pg_sig=""' \
--form 'pg_error_code="1000"' \
--form 'pg_error_description="Internal service error"'