Function extractERC20ApprovalGasSponsorPayload

extractERC20ApprovalGasSponsorPayload(
extensions: Record<string, unknown>,
): ERC20ApprovalGasSponsorPayload
Extracts the ERC-20 approval gas sponsor payload from payment extensions.
Parameters
- extensions: Record<string, unknown>
  The extensions map from a PaymentPayload
Returns ERC20ApprovalGasSponsorPayload
The gas sponsor payload if present, or null
Example
```
const approval = extractERC20ApprovalGasSponsorPayload(paymentPayload.extensions);
if (approval) {
  // Validate and broadcast the approval tx, then settle
}
```
- Defined in extensions/src/erc20-approval-gas-sponsoring/facilitator.ts:31