Add Billplz (#2875)

* Add Billplz

Payment Platform from Malaysia

* Raname Yes -> `apiKey`

Co-authored-by: Matheus Felipe <50463866+matheusfelipeog@users.noreply.github.com>

Co-authored-by: Pawel Borkar <36134699+pawelborkar@users.noreply.github.com>
Co-authored-by: Matheus Felipe <50463866+matheusfelipeog@users.noreply.github.com>

README.md

@@ -688,6 +688,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Alpha Vantage](https://www.alphavantage.co/) | Realtime and historical stock data | `apiKey` | Yes | Unknown |
 | [apilayer marketstack](https://marketstack.com/) | Real-Time, Intraday & Historical Market Data API | `apiKey` | Yes | Unknown |
 | [Banco do Brasil](https://developers.bb.com.br/home) | All Banco do Brasil financial transaction APIs | `OAuth` | Yes | Yes |
+| [Billplz](https://www.billplz.com/api) | Payment platform | `apiKey` | Yes | Unknown |
 | [Binlist](https://binlist.net/) | Public access to a database of IIN/BIN information | No | Yes | Unknown |
 | [Boleto.Cloud](https://boleto.cloud/) | A api to generate boletos in Brazil | `apiKey` | Yes | Unknown |
 | [Citi](https://sandbox.developerhub.citi.com/api-catalog-list) | All Citigroup account and statement data APIs | `apiKey` | Yes | Unknown |