post
https://api.sandbox.com/v1/beneficiaries//pay-in-accounts/business
Creates and associates business entity details with a beneficiary's pay-in account. Use this when setting up a corporate beneficiary to provide company registration information, tax ID/EIN, business address, industry classification, and corporate structure data. This information is required for KYB (Know Your Business) compliance and enables the beneficiary to receive business-related payments.