If you are updating an existing module, click Modules, then the link to the module, then the file upload feature, overwriting and updating the older version.

In admin, under your store, click on the link for Payment Configuration. Assign the module and Update it to install it in your store.

Click the link for Payment via PayPal to enter the configuration settings.

FTP the paypal_1.mv and paypal_2.mv to the Merchant root directory, eg Merchant2/ This is the same directory that your merchant.mv file is located in. It should be the same directory that you have identified the Non-Secure URL to Miva Merchant in your Admin:Domain Settings:Site Configuration. These must be FTP'd; they are not installed as modules.

1) If your account at PayPal is a "Personal" account, you will need to edit the mmui.mv file to incorporate the hyperlink for PayPal payments to personal accounts. Do NOT make this edit if your account is a Business or Premier account. Locate the function UIModule_Invoice in the mmui.mv file. Locate the second TABLE tag in this function if using Merchant 3.x or 4.x or the first TABLE tag in this function if using Merchant 2.x:
<TABLE BORDER = 0 CELLPADDING = 2 CELLSPACING = 0 WIDTH = "100%">
On the line before this table tag, place the following lines:

<MvDO FILE = "{ g.Module_Library_DB }" NAME = "l.module_id" VALUE = "{ Module_Find_ID( Orders.d.pay_id ) }">
<MvIF EXPR = "{Modules.d.code EQ 'paypal'}">
<MvDO FILE="{g.Module_Root$'modules/payment/paypal.mv'}" NAME="l.paypal_link" VALUE="{PaymentModule_Payment_Link()}">
</MvIF>

2) If you want to include a notation in the merchant email which type of payment the buyer used, you can insert the following lines just above the </MvSMTP> tag in your meremail.mv file.

<MvDO FILE = "{ g.Module_Library_DB }" NAME = "l.ok" VALUE = "{ Module_Find_ID( Orders.d.pay_id ) }">
<MvIF EXPR = "{Modules.d.code EQ 'paypal'}">
<MvEVAL EXPR = "{ asciichar( 10 ) $ 'Payment method: ' $ Modules.d.name }">
</MvIF>

You can also change the text in your invoice note if your PayPal account is a "Personal" account, not Business or Premier. To do that, scroll down in the paypal.mv file to the function called PaymentModule_Payment_Link which contains the invoice text. This function contains the link which sends the customer to PayPal personal accounts after placing their order. This should only be changed if you have some experience at mivascripting. Backup before editing.

Since hackers continually come up with new schemes, you must always compare the order total in Miva Merchant with the money received at PayPal. You must go to https://www.paypal.com and verify the actual payment.

With the paypal module, the link to paypal includes the product costs+tax and a separate item charge for shipping. When the customer clicks the link, they see the item cost on the 1st paypal screen at the paypal site. Hidden inputs (you can see them if you view source), include the shipping cost and grand total. As the customer inputs their CC info, the full charges and other info are on subsequent screens.

Because customers can spend a good bit of time setting up their PayPal account, you should be sure that you have a lengthy basket time out setting, e.g. 120 minutes. Typical time out error messages might be: "Your keyboard has been idle greater than 15 minutes. Therefore, your basket was automatically expired before you completed your order." or "Your basket's contents changed unexpectedly during the checkout process. Please press your browser's back button and restart the checkout process." To the customer who has been entering data at the PayPal site, this message might not make sense. The reality is that Merchant can only monitor keystrokes when they are entered in the URL containing merchant.mv. When the customer is at the PayPal site, merchant.mv is not being refreshed periodically.