Rule - BankTransfer for File-Products only

commerce_payment_bank_transfer

{ "commerce_payment_bank_transfer" : {
    "LABEL" : "Bank Transfer",
    "PLUGIN" : "reaction rule",
    "WEIGHT" : "-1",
    "REQUIRES" : [ "rules", "commerce_payment" ],
    "ON" : [ "commerce_payment_methods" ],
    "DO" : [
      { "LOOP" : {
          "USING" : { "list" : [ "site:current-cart-order:commerce-line-items" ] },
          "ITEM" : { "list_item" : "Current list item" },
          "DO" : [
            { "component_rules_bank_transfer_physical" : { "line_item" : [ "list-item" ] } }
          ]
        }
      }
    ]
  }
}

component_rules_bank_transfer_physical

{ "rules_bank_transfer_physical" : {
    "LABEL" : "Bank Transfer for physical Products",
    "PLUGIN" : "rule",
    "REQUIRES" : [ "rules", "commerce_payment" ],
    "USES VARIABLES" : { "line_item" : { "label" : "Line Item", "type" : "commerce_line_item" } },
    "IF" : [
      { "entity_has_field" : { "entity" : [ "line-item" ], "field" : "commerce_file_line_item_files" } }
    ],
    "DO" : [
      { "commerce_payment_enable_bank_transfer" : {
          "commerce_order" : [ "site:current-cart-order" ],
          "payment_method" : { "value" : {
              "method_id" : "bank_transfer",
              "settings" : {
                "details" : {
                  "account_owner" : "Account",
                  "account_number" : "Number",
                  "account_iban" : "IBAN",
                  "bank_code_appellation" : "",
                  "bank_code" : "",
                  "account_swift" : "",
                  "account_bank" : "",
                  "account_branch" : ""
                },
                "subject_oid" : 0,
                "policy" : ""
              }
            }
          }
        }
      }
    ]
  }
}