Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE customers ( customer_id number, customer_details text )
TABLE: CREATE TABLE claims ( claim_id number, policy_id number, date_claim_made time, date_claim_settled time, amount_claimed number, amount_settled number )
TABLE: CREATE TABLE settlements ( settlement_id number, claim_id number, date_claim_made time, date_claim_settled time, amount_claimed number, amount_settled number, customer_policy_id number )
TABLE: CREATE TABLE customer_policies ( policy_id number, customer_id number, policy_type_code text, start_date time, end_date time )
TABLE: CREATE TABLE payments ( payment_id number, settlement_id number, payment_method_code text, date_payment_made time, amount_payment number )

### Question ###
What is the most popular payment method?

### Accurate SQL ###

SELECT payment_method_code FROM payments GROUP BY payment_method_code ORDER BY COUNT(*) DESC LIMIT 1