Bank accounts of Vendors in foreign countries - Automatic Payment

Dears

We are in the processing of implementing DME for online payment transfer to suppliers.

We are now communicating with all our vendors for providing the details regarding their bank and account numbers, Swift, IBAN, etc.

In this context, I am little confused about the foreign vendors. We have vendors from many countries. Hence it is not practically not possible to create "bank key" for every vendor, right ?

Without bank key, system will not permit creation of bank details of vendors in certain countries.

Please advise : Whether bank key should be created for all vendors separately or we can change the setting that bank key is not mandatory ?

If there is no bank key, will that affect the payment processes through SAP ?

Best regards.