getBuyWithFiatStatus
 Once you get a quote  from getBuyWithFiatQuote 
and open the quote.onRampLink  in a new tab, you can start polling for the transaction status using getBuyWithFiatStatus
You should keep calling this function at regular intervals while the status is in one of the pending states such as - "PENDING_PAYMENT", "PENDING_ON_RAMP_TRANSFER", "ON_RAMP_TRANSFER_IN_PROGRESS", "CRYPTO_SWAP_IN_PROGRESS" etc..
 If quote.onRampToken  is same as quote.toToken  (same chain + same token address) - This means that the token can be directly bought from the on-ramp provider.
But if they are different - On-ramp provider will send the quote.onRampToken  to the user's wallet address and a swap is required to convert it to the desired token.
You can use the isSwapRequiredPostOnramp  utility function to check if a swap is required after the on-ramp is done.
 If there is no swap required - the status will become "ON_RAMP_TRANSFER_COMPLETED"  once the on-ramp provider has sent the tokens to the user's wallet address.
Once you receive this status, the process is complete.
 If a swap is required - the status will become "CRYPTO_SWAP_REQUIRED"  once the on-ramp provider has sent the tokens to the user's wallet address.
Once you receive this status, you need to start the swap process.
 On receiving the "CRYPTO_SWAP_REQUIRED"  status, you can use the getPostOnRampQuote  function to get the quote for the swap of type BuyWithCryptoQuote .
 Once you have this quote - You can follow the same steps as mentioned in the getBuyWithCryptoQuote  documentation to perform the swap.