returns an invoice that expires in N seconds
| Lightning address |
|---|
| 0s@lnfail.com |
| 1s@lnfail.com |
| 2s@lnfail.com |
| 5s@lnfail.com |
| 10s@lnfail.com |
| 60s@lnfail.com |
returns a good invoice N% of the time
| Lightning address |
|---|
| 0p@lnfail.com |
| 10p@lnfail.com |
| 20p@lnfail.com |
| 50p@lnfail.com |
| 100p@lnfail.com |