You might consider creating a Discount Code (e.g., the code could be "COD") for 100% off the Item Total, then instruct buyers to enter that code in their cart if they want to pay cash. This would apply a discount equal to the total price of item(s) in the buyer's cart, reducing their order total to 0.00 and allowing them to proceed to our Free Checkout screen to place their order without making an online payment.
To display instructions and explanation about this in your cart, add the following lines to your View Cart code on every page, just before the "// -->" line in the standard View Cart code you obtained from Seller Admin:
function EJEJC_config() {
EJEJC_POSTCALL=true;
}
function EJEJC_shown() {
jQuery("#country1").attr("innerHTML", "Your Country");
jQuery("#tdPmnt").attr("innerHTML",
"If you will pay cash upon delivery, enter <b>COD</b> in
the Discount Code field to reduce your online payment total
to $0.00, then click Checkout to finish placing your order.");
}