Request is too large to process

Hello

I have this error processing payments:

07-19-2020 @ 19:10:51 – Requesting for the Secured Token for the order 5988
07-19-2020 @ 19:10:51 – Requesting for the Secured Token for the order 5988 with following URL and Paramaters: https://payflowpro.paypal.com?xxxxxxxxxxxxxxxxxxxxx
07-19-2020 @ 19:10:51 – Request: Array
(
[VERBOSITY] => HIGH
[USER] => xxxxxxxx
[VENDOR] => xxxxxxxxx
[PARTNER] => PayPal
[PWD[16]] => XXXX
[SECURETOKENID] => xxxxxxxxxx
[CREATESECURETOKEN] => Y
[TRXTYPE] => S
[CUSTREF] => 5988
[USER1] => 5988
[INVNUM] => WC-PPADV5988
[AMT] => 553.79
[FREIGHTAMT] => 0.00
[COMPANYNAME[27]] => Acton Academy at Fall Creek
[CURRENCY] => USD
[BUTTONSOURCE] => AngellEYE_SP_WooCommerce
[RETURNURL[82]] => https://www.sssssss.com/?wc-api=WC_Gateway_PayPal_Advanced_AngellEYE
[URLMETHOD] => POST
[TEMPLATE] => MINLAYOUT
[PAGECOLLAPSEBGCOLOR] =>
[PAGECOLLAPSETEXTCOLOR] =>
[PAGEBUTTONBGCOLOR] =>
[PAGEBUTTONTEXTCOLOR] =>
[LABELTEXTCOLOR] =>
[MERCHDESCR] => sssssssss
[SHIPTOSTATE[2]] => IN
[CANCELURL[103]] => https://www.xxxxxxxxxxx.com/?cancel_ec_trans=true&wc-api=WC_Gateway_PayPal_Advanced_AngellEYE
[ERRORURL[93]] => https://www.xxxxxxxxxxx.com/?error=true&wc-api=WC_Gateway_PayPal_Advanced_AngellEYE
[SILENTPOSTURL[94]] => https://www.xxxxxxxxxxx.com/?silent=true&wc-api=WC_Gateway_PayPal_Advanced_AngellEYE
[ITEMAMT] => 553.79
[L_NUMBER0] => sonrisas-level-1
[L_NAME0] => Sonrisas Level I
[L_COST0] => 489.00
[L_QTY0] => 1
[L_SKU0] => sonrisas-level-1
[L_NUMBER1] => book-margarita-y-margaret
[L_NAME1] => Margarita y Margaret
[L_COST1] => 7.99
[L_QTY1] => 1
[L_SKU1] => book-margarita-y-margaret
[L_NUMBER2] => book-tengo-sentimientos
[L_NAME2] => Tengo sentimientos
[L_COST2] => 5.95
[L_QTY2] => 1
[L_SKU2] => book-tengo-sentimientos
[L_NUMBER3] => book-sali-de-paseo
[L_NAME3] => Salí de paseo
[L_COST3] => 7.99
[L_QTY3] => 1
[L_SKU3] => book-sali-de-paseo
[L_NUMBER4] => book-escribir-los-numeros
[L_NAME4] => Escribir los números
[L_COST4] => 5.95
[L_QTY4] => 1
[L_SKU4] => book-escribir-los-numeros
[L_NUMBER5] => book-las-figuras-geometricas
[L_NAME5] => Las figuras geométricas
[L_COST5] => 5.95
[L_QTY5] => 1
[L_SKU5] => book-las-figuras-geometricas
[L_NUMBER6] => book-un-recorrido-por-las-estaciones
[L_NAME6] => Un recorrido por las estaciones
[L_COST6] => 8.99
[L_QTY6] => 1
[L_SKU6] => book-un-recorrido-por-las-estaciones
[L_NUMBER7] => book-las-estaciones
[L_NAME7] => Las estaciones
[L_COST7] => 6.99
[L_QTY7] => 1
[L_SKU7] => book-las-estaciones
[L_NUMBER8] => book-oso-bajo-el-sol
[L_NAME8] => Oso bajo el sol
[L_COST8] => 7.99
[L_QTY8] => 1
[L_SKU8] => book-oso-bajo-el-sol
[L_NUMBER9] => book-de-la-cabeza-a-los-pies
[L_NAME9] => De la cabeza a los pies
[L_COST9] => 6.99
[L_QTY9] => 1
[L_SKU9] => book-de-la-cabeza-a-los-pies
[TAXAMT] => 0.00
)

07-19-2020 @ 19:10:54 – Secured Token generation failed for the order 5988 with error: There was an error processing your order – Field format error: Request is too large to process
07-19-2020 @ 19:10:54 – Secured Token generation failed for the order 5988 with error: There was an error processing your order – Field format error: Request is too large to process

Do you know which canbe the problem?

Thanks