GST Software Solutions Tax Consultant Tax Practitioners or CA using GSTZen for other clients. Tax Payer Individual Taxpayer or a Partner/Employee in a Company. E-Invoice Solutions API Integration Integrate with our API for seamless E-Invoice generation. Excel Integration Use standard / customized excel at your convenience for E-Invoice. Tally Integration Create E-Invoices from Tally with GSTZen. E-way Bill Solutions API Integration Level up your Business Operations with Eway Bill and automate the processes. GSTIN Validation Solution API Integration Validate GSTIN before using it in E-Invoice and Eway Bill.