Cross-Platform Artcrafts App Development

I need a cross-platform mobile app for our artcrafts team. The app should facilitate mission assignments and include the following features:

Mission Management:
- Mission assignment and tracking
- Notification alerts
- Mission history and reports

Quote Generation:
- Artcrafts user inputs cost estimates
- Automatic 15-20% markup by the app
- Template generation for client signatures

Document Handling:
- Send finalized documents to multiple addresses (client, our company, B2B client)
- Optional credit card payment integration

Integration:
- Must integrate with our accounting software and internal job tool
- Adhere to security protocols

Ideal skills and experience:
- Mobile app development (both iOS and Android)
- Experience with secure document handling
- Familiarity with integrating external tools, especially accounting software
- Background in project management and assignment tracking systems

Please provide estimates for:
- Development time
- Testing
- Delivery
- Cost