Service and invoice with the GST

You can still claim itc. Usually gst, tds, tcs are recognised during the time of payment or credited, which ever is first. So go ahead and claim itc

The certificate is necessary for companies to claim input tax credit and purchase goods and services from other GST-registered businesses. It is issued by The Central Board of Indirect Taxes and Customs (CBIC) after the application is approved. You have an advantage that you can work autonomous in case of sales and you don’t need a certificate

thanks , it was helpful . Can you elaborate.