You will probably need to have a vendor that can take the information on payments received on behalf of the lockbox client and export that data to probably a secure website so the client can pick the information and import it into their system. If not, then the client would not have records to indicate receipt of payment from the consumer.
There are plenty of lockbox service companies out that to assist you. Contact your states bankers assocation and ask for a referral.
Good Luck
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The opinion stated here is what it is, My Opinion.