Build a web applicaton for tax calculation from cryptocurrency trading

Overall functionality: A web application where the user can import their complete cryptocurrency trade history from various exchanges and calculate their capital gains and total value on a per year basis. The user can both import trades automatically using API connection to exchanges, upload CSV/XLSX files directly, or manually input information about a trade or transaction. The user should have two options for calculation method; FIFO (first in first out) or LIFO (last in first out). The web app needs to gather daily price values from [login to view URL] for each cryptocurrency vs. USD, and values from [login to view URL] for currencies such as USD and EUR Every time a cryptocurrency is bought the web app should determine an input value for the price (in NOK) which will be compared to the output value (in NOK) when the same cryptocurrency is sold later. The capital gains on that currency will therefore be output value - input value. A negative capital gains value implies a loss on that trade/transaction. The web application should provide the following output: - Total capital gain (realised) - Total capital loss (realised) - Total value - Balance (list of coins owned) - PDF report that shows all the input and full calculation trail applicable for audit Features: - Import of CSV or XLSX files containing trade history from different exchanges. Typical information is date, time, currency, price, cost, fee - Connect to various exchanges using API and import trade history automatically - Import daily currency price data from [login to view URL] (cryptocurrencies) and [login to view URL] (USD, EUR, GBP etc) - Different transaction types, for example: buy/sell, spend, loss and acquisition (different tax rules for determining the capital gains/losses) - Full list/table of all trades and transactions for each specific year. - Export of PDF report that shows all transactions and trades, and the established input value (in NOK) for each. Report should also show a summary of total capital gains, losses, and the total value of all coins owned on 31st of December each year. - Troubleshooting. Example: if the web app is trying to process a sale of 1.00 BTC, but the user only has 0.99 BTC in his holdings at that time, the web app should return an error message saying that 0.01 BTC is missing to perform the calculation. Because of rounding errors and missing transactions this will occur often and must be presented to the user so he or she can go back and manually correct this. - Login/register user interface - Integrated payment solution (credit card, Vipps) - In general an easy to use graphical user interface Let me know if any questions and I will do my best to explain in more depth. Thank you