Inquiry about PSPs for Trading Platforms - KYC/KYB and Payouts Issues

For those in the Fintech Founders community, I'd like to consult on selecting Payment Service Providers (PSPs), especially for high-volume trading platforms like Forex or Crypto ($BTC, $ETH) with a diverse international customer base.

The issues encountered are the strictness of KYC/KYB, which sometimes takes considerable time and requires extensive documentation. This hinders the onboarding of new users. Occasionally, delayed processes lead users to seek services elsewhere. Additionally, there are challenges with regulatory compliance across various countries that PSPs must support, and crucially, payout reliability. I've encountered cases where customer withdrawals frequently face issues or are delayed beyond the specified timeframe, causing customers to lose confidence. Does anyone have similar experiences or recommendations for PSPs with streamlined KYC/KYB systems and a good track record for payouts? Or PSPs that specifically understand the nature of the trading business, rather than just viewing it from a general payment perspective?