Dear @Ayomide,
Tax percentages are only predefined for static taxes with fixed rates — such as VAT, which is specified at 7.5% in the endpoint response.
Other tax categories, however, are variable and may differ based on transaction type, volume, and location. Therefore, as a System Integrator, you should provide a configurable field within your solution to allow taxpayers to manually input applicable tax percentages where they are not predefined.