Set Customer Default Payment to Acumatica Pay via import scenario or mass update

For new customers the Default Payment Method is set to Acumatica Pay and works. However, I have over 100,000 customers with defaults set to Authorize.net.  I need to change them to Acumatica Pay as the default when an Acumatica Pay account does not exist for the customer.

I created a GI that selects the correct customers.  I have tried the import scenario a couple of different ways, with none of them working.

<Line Number> line was used to set Authorize.net as the default when we first got on Acumatica.  I do not know how to get the Line Number for the Acumatica Pay method.

PaymentMethod table PaymentMethodID = TXACUCC

                                    PaymentInstanceID = 58452

Either way I run it the default is set to the first payment method which is the default cash option.

Please Help.