I am using a third party CRM to generate my invoices and add new products. I then sync that information to QBO to create a corresponding invoice with the same products/services. Today, we use QB Payments to capture the payments. However, I don't want to use the QBO invoices, I'd rather use my CRM's invoices. I'm using API's to move the data between the systems. 

Here's my problem: I need the URL that gets generated whenever I specify that an invoice should include ACH and CC payment options. I simply want to bypass the QBO invoice and go straight from CRM invoice to payment gateway through QB Payments. I need to get the URL from QB API's and insert it into my invoice. I'm not seeing anywhere int he documentation that allows this. How do I do this? What am I missing?