They are enumerated here: alpha.pwstaging.com.au/docs/api-integration-guide#payment-amounts
| Method | Description | Restrictions |
|---|---|---|
| 99 | 99Bill | CN |
| AL | Alipay | |
| CC | Bank card | |
| CP | CUP (GZ/Gnete) | |
| DD | Direct Debit/ACH (eCheck in US) | |
| DU | Direkt-Überweisung | DE only |
| EN | eNets | SG only |
| IC | Inicis | KR only |
| ID | iDEAL | NL only |
| IN | Inpay | |
| PO | POLi Payments | AU/NZ only |
| PP | PayPal | |
| SB | SOFORT | |
| SK | Skrill | |
| SP | SafetyPay |
https://github.com/mage2pro/alphacommercehub/blob/0.0.4/etc/options.json#L1-L17