Unless I am totally misunderstanding what you are outlining, the process you are proposing is in AR. Our process has to be done in AI before the invoices are emailed.

We have a mixture of paid and unpaid invoices in an archived/active batch that we are preparing to send to customers. It is the intermediate step of the process that we are trying to solve where we match offline CC payments and insert the payment information (1 field - up to 12 characters of text) into the matching invoice - that's it - period.

I don't know Gridview but have a gut feel that it can do the process.

Thanks