Estimate and invoice should be 1 document. Job ID parts ordered tracked on Estimate. Customer pays 10% deposit for Estimate. Then when job is finished final payment is included as receipt/invoice. Estimate, invoice, receipt purchase order with tracking for parts needs to be 1 document. JOB ID will be the name with customers details. And payment options in the document. Tap to pay CC, venmo, zelle, PayPal Cash app all with tabs below finished job. So customer can pay easy. And have all the payment Qr codes or links connected to final amount of payment for the Job. 1 document for everything. Estimate, invoice, deposit, purchase order and finished job included in the fi al receipt.