To represent the cost of the subscription (for Offer), you can use the UnitPriceSpecificationtype and unitCodeproperty .
The value of unitCodes can be a common UN / CEFACT MONcode , where is the month code.
In Microdata, it might look like this:
<div itemscope itemtype="http://schema.org/Product">
<div itemprop="offers" itemscope itemtype="http://schema.org/Offer">
<div itemprop="priceSpecification" itemscope itemtype="http://schema.org/UnitPriceSpecification">
Prices start at <meta itemprop="priceCurrency" content="PHP" />Php
<span itemprop="price">1799.00</span>
<meta itemprop="unitCode" content="MON">(monthly)
</div>
</div>
</div>
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