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<form action='https://secure-test.worldpay.com/wcc/purchase' method=post>
  <input type='hidden' name='instId' value='1341245'/>
  <input type='hidden' name='amount' value='17.99'/>
  <input type='hidden' name='cartId' value='test'/>
  <input type='hidden' name='currency' value='GBP'/>
  <input type='hidden' name='testMode' value='100'/>
  <input type='submit' value='The Greatest Showman £17.99'/>
</form>