Shipping API Development

I need a Shipping API built to calculate Royal Mail shipping rates and estimate landing costs for DDP. The API needs to be built using Node.js (TypeScript) and must integrate with Shopify and Royal Mail. LANDED COSTS VISIBILITY V2 REST API API SPECIFICATION

Requirements:
- Calculate shipping rates
- Estimate landing costs for DDP
- Integrate with Shopify and Royal Mail
- Built using Node.js (TypeScript)

Ideal Skills and Experience:
- Experience with API development
- Proficiency in Node.js and TypeScript
- Familiarity with Shopify and Royal Mail APIs
- Strong problem-solving skills
- Ability to deliver within budget constraints