What is the best software to manage e-invoicing in SAP?

 There isn't a single "best" software for managing e-invoicing in SAP, as it often depends on specific business needs, the SAP modules being used, and integration requirements. However, some popular solutions often used with SAP for e-invoicing include:

1. **SAP Ariba**: Known for its robust procurement and supply chain solutions, Ariba offers e-invoicing capabilities that integrate well with SAP systems.

2. **OpenText Vendor Invoice Management (VIM)**: This solution streamlines invoice processing within SAP, offering automation and integration features.

3. **Esker**: Provides automation solutions for document processing, including e-invoicing, with integration capabilities for SAP systems.

4. **ReadSoft**: Now part of the Lexmark family, ReadSoft offers solutions for invoice processing and automation that can integrate with SAP.

The choice often depends on factors such as the complexity of your invoicing process, the scale of your operations, existing SAP modules, budget considerations, and specific functionalities required by your business. Consulting with SAP experts or evaluating demos from these providers might help determine which software aligns best with your needs.