P&L Unrealized profit or loss of the current position.Calculation formula of P&L:1) Long positions with the trading currency serving as the margin currency, and the P&L is calculated in the trading currency.P&L = Total assets - (liability + interest) / mark price2) Long positions with the quote currency serving as the margin currency, and the P&L is calculated in the quote currency.P&L = Total assets * mark price - (liability + interest)3) Short positions with the quote currency serving as the margin

In the above case, we could calculate a polynomial p(x) from I(x). When we use an extension_factor of 8, we will calculate another 32(8-1)* points on p(x). Since two different polynomials with D degree will share at most D points, an example polynomial pair with a valid polynomial (which satisfies the above constraints) and a fake polynomial with D degree (which does not satisfy the above constraints) will share at most D points.

For example, a common mistake involves entering the instrument as "BTCUSDT" instead of "BTCUSDT.P," inadvertently omitting the ".P" at the end. This specific format is crucial because we're dealing with perpetual contracts rather than spot trading. By aligning your instrument field with the correct format as outlined in the specifications, you can resolve this error and ensure seamless signal transmission.8. I received an error - "maximum allowed lag time being exceeded". What does this mean?