Paystack is a Splynx add-on which allows customers to pay for invoices via the payment gateway - https://paystack.com/.
The add-on can work with different credit cards and bank accounts, if cards or bank accounts are saved in customer profiles, the add-on allows you to charge all customers using Direct debit orders.
¶ Add-on installation
The add-on can be installed in two methods, via the CLI or the Web UI of your Splynx server.
To install the Paystack add-on via CLI, the following commands can be used:
apt-get update
apt-get install splynx-paystack
To install it via the Web UI:
Navigate to Config → Integrations → Add-ons:
Locate or search for the splynx-paystack add-on and click on the Install icon in the Actions column:
Click on the OK, confirm button to begin the installation process:
¶ Add-on settings
After the installation process has completed, you have to configure the parameters in Config → Integrations → Modules list. As depicted below:
Locate or search for the splynx-paystack add-on module and click on the
(Edit) icon in the Actions column:
Public and secret keys can be obtained from your Paystack account:
¶ Invoice payment
Once the configuration has been completed, customers can pay their invoices on the Portal using the Paystack system in Finance → Invoices:
or directly from Portal Dashboard via Paystack widget (entry point):
The configuration of add-on Entry points can be found in Config → Integrations → Modules list, near the splynx_paystack_addon module item in Actions column, click on the 
(Edit entry points) icon. More information about Modules list can be found here.
If everything goes well, you will see the status of the invoice marked as Paid (on the customer and admin portal):
Additionally, you can charge all customers using one button, navigate to Finance → Invoices, set the period and click on Charge button as depicted below:
¶ Add-on log files
Paystack add-on logs can be found in Administration → Logs:
In Paystack Logs the different records can be viewed, like when a verification was performed or when a transaction was processed, etc.
¶ Direct payments
Using the payments links is the simplest way to accept payments made with credit card or bank account. This feature is available in the Paystack add-on to pay Invoices and Proforma Invoices. This provides convenience and simplicity for your customers, so the amount of on-time payments will increase. For example, you can add a payment link to the e-mail with the (proforma) invoice, as a result, the customer can make payment quickly by clicking onto such link instead of logging in to their Portal page. In case the customer has saved the payment credentials on the Portal, they do not need to add further details when using the direct payment link in the future. If the credit card in not linked on the Portal, the payment details need to be entered each time the payment link is used.
To create a direct payment link, please use the patterns below:
To pay the Invoice:
by invoice ID
https://<splynx_domain_address>/paystack/direct-pay-invoice-by-id?item_id=<Invoice_id>
by invoice number
https://<splynx_domain_address>/paystack/direct-pay-invoice?item_id=<Invoice_number>
To pay the Proforma Invoice:
by proforma invoice ID
https://<splynx_domain_address>/paystack/direct-pay-proforma-by-id?item_id=<proforma_id>
by proforma invoice number
https://<splynx_domain_address>/paystack/direct-pay-proforma?item_id=<proforma_number>