Function parseERC20ApprovalGasSponsorHeader

parseERC20ApprovalGasSponsorHeader(
header: string,
): ERC20ApprovalGasSponsorPayload
Parses an ERC-20 approval gas sponsor header from client request.

The header format is base64-encoded JSON.
Parameters
- header: string
  Base64-encoded gas sponsor header value
Returns ERC20ApprovalGasSponsorPayload
Parsed gas sponsor payload
Throws
Error if header is invalid
Example
```
const payload = parseERC20ApprovalGasSponsorHeader(
  request.headers['x-t402-erc20-approval-gas-sponsoring']
);
```
- Defined in extensions/src/erc20-approval-gas-sponsoring/server.ts:86