When you have successfully registered and activated your Midtrans account, you can change the name of the Merchant which can be changed on the Midtrans portal.
If you have not registered/activated an account, click the following article Registration & Activation Midtrans. Now, you can check the explanation down below on how to change your merchant name :
Step 1. Login to Midtrans Portal
After successfully logged in, you will be directed to the Dashboard page.
Step 2. Select Settings, then Choose General Settings
Step 3. Change Merchant Name
Notes : Don't forget to save the changes you've just made, now you've successfully changed your merchant name on your Midtrans account.
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You need to first input the server key into DealPOS so that the registered QRIS can be used by the cashier. For details, check the following article : Input Server Key Gopay QRIS in DealPOS
FAQ about using midtrans, you can check this article : FAQ (MDR + Payout)
Did you have multiple Outlets registered with Midtrans-QRIS? If you do so, you need to set up the server key with the explanation in the following article : Mobile Payment (QRIS) for Multiple Outlets.