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This depends on what your contract of employment or the employer's terms anf conditions say about sick pay and absence from work.
It is common for employers to ask for a medical certificate to be provided within a certain time and for this to be a contractual term which gives them the right to refuse to pay you if it is not produced in time.
If you are absent from work due to sickness they are entitled to mark you down as sick as you did not work the hours.
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