wordpress - Contact form 7 set minimum field value -

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i want set minimum value in "amount" field. error message should lower minimum value.

<p>amount:<br />   [text* amount]</p>   <p>name :<br />     [text* your-name] </p>  <p>email :<br />     [email* your-email] </p>  <p>message :<br />     [textarea your-message] </p>   <p>[submit "send"]</p>

contact form 7 has number field. so, in case, like:

[number* amount min:10 max:99 step:1 "40"]

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