The most probable reason is that your currency is NOT supported by PayPal. Please check the list below for the supported currencies:
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Currency(Code)
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Australian dollar (AUD)
Brazilian real 2 (BRL)
Canadian dollar (CAD)

Chinese Renmenbi (CNY)
Czech koruna (CZK)
Danish krone (DKK)
Euro (EUR)
Hong Kong dollar (HKD)
Hungarian forint  (HUF)
Indian rupee (INR)
Israeli new shekel (ILS)
Japanese yen  (JPY)
Malaysian ringgit (MYR)
Mexican peso (MXN)
New Taiwan dollar (TWD)
New Zealand dollar (NZD)
Norwegian krone (NOK)
Philippine peso (PHP)
Polish złoty (PLN)
Pound sterling (GBP)
Russian ruble (RUB)
Singapore dollar (SGD)
Swedish krona (SEK)
Swiss franc (CHF)
Thai baht (THB)
United States dollar (USD) 

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We suggest changing to a more common currency (please see the list) if you wish to use PayPal as a payment method.
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For country-specific offerings and limitations, see PayPal Offerings Worldwide and visit your country-specific site.

Alternatively, you can use Stripe for credit card payments. Click here to learn more.

Just send us an in-app message if you have further questions.