Open-Ended Receive Link (No Pre-Set Amount)

It would be helpful to support receiving Bitcoin without requiring a fixed amount to be set in advance. Ideally, this could be implemented using a BIP21 URI with both an on-chain address and a Lightning address or BOLT12 invoice.

Example Use Case:

For payroll, when user invoices the amount in USD and provides the accountant with a Bitcoin address. The employer sends the payment using the exchange rate in their own system, which may differ from Bringin’s without needing to manually enter the Bitcoin amount into Bringin.

This flexibility would simplify reimbursement and payroll flows, and make Bringin easier to use with external wallets.