- Add Dexter as secondary facilitator option (no API keys required)
- Create FACILITATORS config with CDP and Dexter settings
- Update server middleware to support multiple facilitators
- Add PRIMARY_FACILITATOR environment variable
- Create example client for Dexter payments
- Document Dexter features: 600K+ free tx/month, gas sponsored
Dexter has ~50% market share and requires no authentication,
making it an ideal backup/secondary facilitator option.
