How to create a provider of validation

well, i would say that at least you need to include your class by replacing
use Cake\Validation\Validate
by
use Maitrepylos\Validation.
then maybe you need to bind a provider as explained in the doc

http://book.cakephp.org/3.0/en/core-libraries/validation.html#adding-validation-providers
but I didn't use it yet.

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