brotherton-erpnext/erpnext/docs/user/manual/en/accounts/payment-request.md

Payment Request is sent via Email and will contain a link to a Payment Gateway if setup. You can create payment request via Sales Order or Sales Invoice.

- Create Payment Request via Sales Order
<img class="screenshot" alt="Payment Request" src="{{docs_base_url}}/assets/img/accounts/pr-from-so.png">

- Create payment Request via Sales Invoice
<img class="screenshot" alt="Payment Request" src="{{docs_base_url}}/assets/img/accounts/pr-from-si.png">

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Select appropriate Payment Gateway Account on Payment Request. Account head specified on payment gateway will 
considered to create journal entry. 

Note: Invoice/Order currency and Payment Gateway Account currency should be same.

<img class="screenshot" alt="Payment Request" src="{{docs_base_url}}/assets/img/accounts/pr-details-1.png">

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##### Notify Customer
You can notify customer from Payment Request with print format. If customer contact email is mentioned, it will automatically fetch email. If not so you can set email id on Payment Request. 

<img class="screenshot" alt="Payment Request" src="{{docs_base_url}}/assets/img/accounts/pr-details-2.png">

##### Request Mail
<img class="screenshot" alt="Payment Request" src="{{docs_base_url}}/assets/img/accounts/pr-email.png">