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String de validação - PIN 4 digitos WHMCS

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Como faço para inserir um string de validação para que o WHMCS valide um PIN de 4 digitos? Por exemplo, se meu cliente for comprar a licença do Smart IPTV, que vendo e ele quiser definir um PIN de 4 digitos e não mais de 4, com números de 0 a 9, podendo ser aleatorios, por ex: 1234. 1987, 0342. etc...

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