Custom pricing for GST Verification API

Hi,

I am looking at a custom pricing as the existing plan are a bit costly for us. I am looking at a per api call pricing as our requirements are a bit limited. The unlimited and high price subscription is a bit costly for us. We would like to recharge and track the amt of api calls done and upon nearing end, we recharge again. This would be economical to us and also you will have a continuous business from us. 

Kindly let us know if such custom pricing can be accommodated for us. 

Thanks & Regards,

Praveen