Function parseEip2612GasSponsorHeader

parseEip2612GasSponsorHeader(header: string): Eip2612GasSponsorPayload
Parses an EIP-2612 gas sponsor header from client request.

The header format is base64-encoded JSON.
Parameters
- header: string
  Base64-encoded gas sponsor header value
Returns Eip2612GasSponsorPayload
Parsed gas sponsor payload
Throws
Error if header is invalid
Example
```
const payload = parseEip2612GasSponsorHeader(
  request.headers['x-t402-eip2612-gas-sponsoring']
);
```
- Defined in extensions/src/eip2612-gas-sponsoring/server.ts:83